[Q] will lt18i's 3g work on usa if i dump an lt18a rom in it? - Xperia Arc Q&A, Help & Troubleshooting

I saw alsaqr's ealier post that he unlocked japanese version of lt15i and dumped an lt15a rom into it and he made it work on AT&T's 3g network on April which lt15a hasn't been out yet at April.
Therefore i was wondering if i buy unlocked lt18i and do exactly what alsapr did, which dump an lt18a rom to unlocked lt18i device, will it's 3g work on AT&T?
I know there is lt15a is out but i want to get white version and would be nice to have little bit better version than original one since global version is out already.
or should i just buy an lt15a since there isn't too much difference other than 1.4Ghz processor and 2D&3D panorama camera function.
(and proceeder device is about $50 cheaper)
Can anyone help me out..?

Dumping an 'A' rom onto 'i' hardware wont help, mate. People with AT&T usually dump 'i' roms onto their 'A' hardware (that supports AT&T 850/1900 MHz UMTS) just to get faster updates and it doesn't change 3G bands (HW can't be altered by SW). So in a nutshell, hardware version is the only concern when you're worried about your carrier's 3G compatibility. You can flash any kind of rom ('a', 'i', 'custom') onto an 'A' hardware and I'm pretty sure it'll support ATT UMTS. I'm actually waiting for LT18A to come out as well
By the way, I already have an Arc (LT15A). I need another phone anyway, so I'll get an Arc S. But you should check the link
.xperiablog.net/2011/10/17/xperia-arc-s-review-benchmarks-galore/
it'll help you decide which one you need. electronicsshowplace.com is selling LT15A for an incredible $370 price.
.electronicsshowplace.com/advanced_search_result.php?osCsid=mnrhcu9o6bg7a7gm71e3ja0le2&search_in_description=1&keywords=xperia&pfrom=&pto=&categories_id=3710&x=0&y=0
Hope this helps.
---------- Post added at 03:31 AM ---------- Previous post was at 03:13 AM ----------
Beside the processor and camera features, I think there is another major upgrade on Arc S- HSPDA has been boosted to 14mbps (from Arc's 7 mbps). So an LT18A might get better data speed on ATT 3.5G network (they call it 4G though!) . I've an ATT xperia play 4G. Its data speed is a little faster than my LT15A. But if you are going to use wifi most of the times - don't even bother about this difference.

Related

[Q] R800i Telstra NextG

Hi. I recently bought an Xperia Play from eBay but I later discovered that it is an R800i model and not compatible with Telstra NextG (850mhz band I beleive) so I am stuck using older GSM networks (no regular 3g out here) meaning I rarely get any signal (at least when I'm at home). Is the hardware between models identical meaning it is possible to flash to an R800a ROM or official Telstra ROM (whatever its called) to fix this? I searched the forums and google but I couldn't find an R800a ROM, is there a reason for this? Can it be done yet? Let me know
The hardware radio is different, i/a roms will flash fine between the two because at this stage radios are not being flashed..
Sorry for the bad news
Sent from my R800i using XDA Premium App
Oh well thanks anyway...I might have to switch to optus or something then...
Reviving this thread instead of starting a new one.
Is there a way to change the radio of a R800i to support Tesltra's NextG? I swapped radios all the time on my Desire and am wondering if the same is possible on the Play...
Look up all the bands for the different play versions, flash the firmware that has it if there is one?
Sent from a Galaxy far, far away
no, you cant, r800i has an 900mhz radio and r800a is 850mhz, you can buy a telstra xperia play at kmart atm for $200 telstra locked prepaid.
Most of the roms i use my r800a are actually r800i roms but they offer better market support, so its best to use them, imo.
Hey Maelstrom, but when you change your rom to a 800i, does your frequency changes to 900mhz?
No, the Radio isn't touched when u change roms, if it was flashed with a 900mhz radio the radio would just not work until you flashed it with the correct 850mhz software.
Consider the R800a and r800i firmware completely interchangeable for the most part, but as I mentioned earlier, market support is better on the r800i roms, so that's why I use it.

[Q] R800i, R800x, R800a

This may be a stupid question, but can someone tell me what's the difference between R800i, R800a and R800x?
Geeve said:
This may be a stupid question, but can someone tell me what's the difference between R800i, R800a and R800x?
Click to expand...
Click to collapse
R800x is the CDMA Verizon Wireless USA variant, and is currently unrootable, but runs stock vanilla Android.
R800i is the original GSM variant sold over in Europe and the UK.
I'm not entirely sure about the R800a, my brain is giving me conflicting stories about Taiwan/Singapore, and Canada Rogers versions.... I could be ENTIRELY wrong on that though.
One is for verizon, one is for some other US network and the R800I is for the rest of the world i think
Models so far?;
r800i (uk, europe, australia, new zealand, asia?)
r800a (canada rogers, mexico + also asia?)
r800at (usa at&t)
r800x (usa verizon)
Z1i (china?)
They all have the same specs internal memory, processor e.t.c
In Mexico we get r800a too. With all the sony experience.
So the models depend on the location or the providers.
Geeve said:
So the models depend on the location or the providers.
Click to expand...
Click to collapse
Both. In the case of U.S.A you guys get R800x for Verizon and R800at for At&T
Geeve said:
So the models depend on the location or the providers.
Click to expand...
Click to collapse
I would say model depends on providers since anyone using gsm is likely to get the R800i or R800a anyone using cdma is gonna get the R800x or R800at.
The only difference in GSM and CDMA is gsm phones have a simcard, CDMA phones dont have simcards your account information is programmed onto your phone. Dunno if the CDMA xperia plays have R-UIM cards though? CDMA is supposed have have faster data transfer speeds (internet) up to 700kbps (EVDO). Gsm is roughly 400+kbps (HSDPA)
Gsm is world wide and CDMA is mainly usa and some parts of asia
I thought there was a dev model as well whats that one called?
Saw someone talking about it somewhere
Sent from my R800i using XDA App
The only difference between the R800a and R800i is the HSDPA radio frequency set. You can buy both in Australia as both frequency sets are in use by various carriers.
R800i works on 900MHz and 2100MHz
R800a works on 800MHz 850MHz, 1900MHz and 2100MHz
Firmware images are compatible between R800i and R800a.
Both are incompatible with R800x as far as I know.
I don't know about the R800at.
Mozza2k11 said:
I would say model depends on providers since anyone using gsm is likely to get the R800i or R800a anyone using cdma is gonna get the R800x or R800at.
The only difference in GSM and CDMA is gsm phones have a simcard, CDMA phones dont have simcards your account information is programmed onto your phone. Dunno if the CDMA xperia plays have R-UIM cards though? CDMA is supposed have have faster data transfer speeds (internet) up to 700kbps (EVDO). Gsm is roughly 400+kbps (HSDPA)
Gsm is world wide and CDMA is mainly usa and some parts of asia
Click to expand...
Click to collapse
R800at isn't CDMA (its another GSM Variant). Interestingly, although it seems to do nothing and has a plastic bit inserted in the way, the CDMA (R800x) version does have a sim-card slot, and if you go into some of the diag screens, you can turn on GSM... I haven't tried getting a prepaid sim to see if it works though. So the R800x might just have both if we are lucky, however I doubt its fully enabled in the kernel level.
R800i is also Oceania ( AUS/NZ )
ryocoon said:
R800at isn't CDMA (its another GSM Variant). Interestingly, although it seems to do nothing and has a plastic bit inserted in the way, the CDMA (R800x) version does have a sim-card slot, and if you go into some of the diag screens, you can turn on GSM... I haven't tried getting a prepaid sim to see if it works though. So the R800x might just have both if we are lucky, however I doubt its fully enabled in the kernel level.
Click to expand...
Click to collapse
Thanks for the info. I was sure R800i & R800a are GSM and i knew R800x was CDMA wasnt sure about r800at so i just presumed it was CDMA as well
I cannot remember the post but i think someone has tried a sim card in the r800x and said that it has been fully disabled.
I'm in Singapore, R800i's here as well - nice thing about buying a phone here, all are carrier unlocked / government considers it illegal [monopoly] for carriers to sign exclusive deals... although I might get caned for exporting them.
Same here. No companies should be allowed to lock phones to their networks.
However some companies have been cheeky and released different phones that don't support the other carriers cell tower transmission.
I can confirm the R800at is the AT&T version. It even has the AT&T boot animation and comes loaded with 2.3.3.
I got mine in the mail today off ebay. So far, I am really enjoying it. I get H+ as my connection icon, and which is different.
Sent from my R800at using Tapatalk
correction, mate!!
Mozza2k11 said:
Models so far?;
r800i (uk, europe, australia, new zealand, asia?)
r800a (canada rogers, mexico + also asia?)
r800at (usa at&t)
r800x (usa verizon)
Z1i (china?)
They all have the same specs internal memory, processor e.t.c
Click to expand...
Click to collapse
im aussie, and its the R800a thats sold here. its discontinued, and also telstra locked.
ryocoon said:
R800x is the CDMA Verizon Wireless USA variant, and is currently unrootable, but runs stock vanilla Android.
R800i is the original GSM variant sold over in Europe and the UK.
I'm not entirely sure about the R800a, my brain is giving me conflicting stories about Taiwan/Singapore, and Canada Rogers versions.... I could be ENTIRELY wrong on that though.
Click to expand...
Click to collapse
You can root the Verizon model. If it is on anything higher than 2.3.3 you just have to flashtool back to 2.3.3 and then run super one click.
Posted over two months ago...
Sprint Samsung Galaxy S II Epic 4G Touch w/ Stock 4.0.4
Xperia Play R800X w/ supercharged stock 2.3.3 and doomkernel
Aussie_U8800 said:
im aussie, and its the R800a thats sold here. its discontinued, and also telstra locked.
Click to expand...
Click to collapse
Im aussie too and the 800i is/was sold here for the optus/vodaphone network. You can use the 800i on telstra but you can only get 2g, no 3g goodness due to the frequencys used.

[Q] Xperia Arc on T-mobile 3g

Okay I have been confused on this matter since the release of this phone. I have searched this forum and honestly cannot find the answer so please don't begin to leave rude messages
My main question is which model of this phone is working on T-mobile 3g
I have read in some threads through google that LT51i is working for t-mobile 3g but i read the specs and it only supports the 900/2100 3g freq which does not work for t-mobile back here in the states. I know it requires the AWS frequency of 1700/2100
Now on a side note I have seen only a limited amount of information that the Docomo verison of the Xperia Arc is working on t-mobiles 3G network.
Can someone please clarify what is true and what is not so I can obtain the correct phone to use here in the states? I have an International version of the HTC Incredible S and I love the phone other than the fact it goes through countless shut-downs and reboots through out the day which made me give up on HTC products. I have owned countless sony ericsson phones since the k800i which was awesome. Since I got to the x10 I was disappointed with performance and lack of support. So Im hoping what I have read that sony supports this phone more than the X10 was makes me interested in getting it.
Thank you
fjnty5 said:
I have searched this forum and honestly cannot find the answer so please don't begin to leave rude messages
Click to expand...
Click to collapse
Well here's what my 30 second google search found - http://forum.xda-developers.com/showthread.php?t=1116325, should help.
That explained nothing of it being workable with T-mobile and had little relevant information thanks your the inquiry though bro
So Do I!!!!
I have the same issue with my Xperia Arc Lt15i and T Mobile.
Please Help, you are the experts..
I am on T-Mobile in the Netherlands and visited the US in May, my Arc worked all the time and I think it was using the US T-Mobile when it was available.
None of the 2011 series of Xperia phones has the AWS band required for T-Mobile US 3G (UMTS/WCDMA/HSPA) network. They will work on T-Mobile 2G only.

Xperia play 4g on tmobile usa

Hey I was wondering if u unlock sim card on the at&t xperia play if it will connect to tmobiles 4g or at least the 3g, I will be gettin the r800at soon and wanna know if anyone has it on tmobile and if they are getting 3g or 4g.
If someone already posted this I'm sorry I searched but couldn't find anything
Thanks
You'll be getting EDGE or 2G whatever you want to call it. T-Mobile runs on a special frequency that AT&T doesn't.
That sucks that's the reson I wanted the r800at ohwell thanks for the info
Hope 3g or 4g will work once the merger happends with at&t and tmobile lol
coronasailor said:
Hope 3g or 4g will work once the merger happends with at&t and tmobile lol
Click to expand...
Click to collapse
T-mobile in the US uses the same band it uses in the UK. Thats why it differs from the other US GSM networks If you buy a EU device you can use T-Mobile 3G.
Sent from my R800i using Tapatalk
I dont mean to rain on anyones parade, but i thought id go and check this out because that didnt sound correct.
Tmobile 3g seems to require the AWS band, no available model of the xperia play carries that band.
Tmobiles setup uses one band for uplink and one for down, not one or the other, these bands being 1700 and 2100, the r800i carries 900/2100 and the r800a and r800at carry 800/850/1900/2100.
as you can see theres no 1700 band available on any xperia play model afaik. so it appears you might be sol sorry :/
Thanks for all the info so its stupid tmobile that sucks they should have just came out with a tmobile one when the one for at&t came out such jerks well at least I can play games lol ill just have to conect to wifi when I wanna download stuff or watch videos ohwell
T-Mobile needs to step up and get OFF 1700! NOBODY uses that freq! I WANT 3G
Hell ya I agree I only got tmobile cuz they had the sidekick 2 back in the day and just never changed kept doin the 2 year contract thing ohwell
"I dont mean to rain on anyones parade, but i thought id go and check this out because that didnt sound correct.
Tmobile 3g seems to require the AWS band, no available model of the xperia play carries that band.
Tmobiles setup uses one band for uplink and one for down, not one or the other, these bands being 1700 and 2100, the r800i carries 900/2100 and the r800a and r800at carry 800/850/1900/2100.
as you can see theres no 1700 band available on any xperia play model afaik. so it appears you might be sol sorry :/""
When I flashed my R800at to 2 different generic stock firmwares (which changed my model number to R800i & R800a)my mobile connection changed to Edge. It also changed when I went into the settings>network mode& change it to "GSM only". It only went back to H or HSPA & 3g when I changed the APN's & changed network mode back to WCDMA (preferred)/GSM. Does that mean that the AT&T XPlay can connect to an Edge(2g) network but not Tmobile's 3g network?? What if we changed the APN? If anyone tries this please post the results here.
Ok so I was wrong & I can confirm that the Att Xperia Play will not work on Tmobile's 3g or 4g under any circumstances. Only edge/2g data will work due to the difference in bands as was mentioned here.
Sent from my R800a using XDA App
well... that sucks. looks like i'll be getting an amaze 4g when i get back from Africa in spring!
(i only ordered the no-contract AT&T xperia play 4g to use on the "orange" network here, i don't want to have AT&T in the states. only t-mobile and verizon have 4g in my area, and i want to keep GSM for next time i travel, so t-mobile it is)

[Q] R800at for USA T-Mobile - Anyone using this setup?

I will be finishing my contract with VZ in about 2 months and I have seriously been considering getting a R800at (AT&T Xperia PLAY) and unlocking the bootloader to also remove the simlock. So that I can use it on T-Mobile here where I live. VZ has sucky service in my area and I hate them anyways.
My question is are there anyone people here using the AT&T 4G (I know its not 4G but 3.5G Xperia PLAY) on T-Mobile and with TMo converting their 2G to AT&T 3G compatibility are you able to use the 3G service on your PLAYs?
I know the service coverage is all subjective to where you live, just curious if anyone is doing this and what their feedback / thoughts are on it.
Thank you in advance
ozzmanj1 said:
I will be finishing my contract with VZ in about 2 months and I have seriously been considering getting a R800at (AT&T Xperia PLAY) and unlocking the bootloader to also remove the simlock. So that I can use it on T-Mobile here where I live. VZ has sucky service in my area and I hate them anyways.
My question is are there anyone people here using the AT&T 4G (I know its not 4G but 3.5G Xperia PLAY) on T-Mobile and with TMo converting their 2G to AT&T 3G compatibility are you able to use the 3G service on your PLAYs?
I know the service coverage is all subjective to where you live, just curious if anyone is doing this and what their feedback / thoughts are on it.
Thank you in advance
Click to expand...
Click to collapse
I have the R800a on T-mobile USA and im stuck on Edge which is 2g. If you want 4G or 3.5G for your play your stuck with At&t otherwise if you go to t-mobile usa your stuck with 2g on your R800at the same boat as me.
I get 4g fine with an att sim on straight talk but sadly only 2g with t mobile sim. Suppose it doesn't matter to me though since in using r800i firmware. Stuck on 3g
Sent from my R800i using xda premium
CrypticRook said:
I get 4g fine with an att sim on straight talk but sadly only 2g with t mobile sim. Suppose it doesn't matter to me though since in using r800i firmware. Stuck on 3g
Sent from my R800i using xda premium
Click to expand...
Click to collapse
Straight supports at&t frequences and towers.
ozzmanj1 said:
I will be finishing my contract with VZ in about 2 months and I have seriously been considering getting a R800at (AT&T Xperia PLAY) and unlocking the bootloader to also remove the simlock. So that I can use it on T-Mobile here where I live. VZ has sucky service in my area and I hate them anyways.
My question is are there anyone people here using the AT&T 4G (I know its not 4G but 3.5G Xperia PLAY) on T-Mobile and with TMo converting their 2G to AT&T 3G compatibility are you able to use the 3G service on your PLAYs?
I know the service coverage is all subjective to where you live, just curious if anyone is doing this and what their feedback / thoughts are on it.
Thank you in advance
Click to expand...
Click to collapse
Have you considered using your 800X on another CDMA network instead of buying an 800AT?
Xperia Player said:
Have you considered using your 800X on another CDMA network instead of buying an 800AT?
Click to expand...
Click to collapse
No. Most of my family has switched to tmobile. That and I can get an awesome rate as I have a relative who can hook us up n
Sent from my GT-P7510 using xda premium
ozzmanj1 said:
No. Most of my family has switched to tmobile. That and I can get an awesome rate as I have a relative who can hook us up n
Sent from my GT-P7510 using xda premium
Click to expand...
Click to collapse
An awesome rate stuck on 2G doesn't sound worth it to me.
I would look into: Sprint, Boost Mobile, Metro PCS.
(Not sure if Virgin Mobile and Straight Talk are CDMA tho)
There's a list of current locations where T-Mobile support the 1900MHz band, you'll have to check it to make sure you're in one of those area, and to be on the safe side, not on the edge but within the city zone. http://www.androidcentral.com/tags/t-mobile
I live in Miami which is one of the supported location so I did exactly that. I cancelled my LG Nexus 4 preorder since it's taking a long time to ship and bought an R800i, talk about vast gap in performance. I will report on it once it get here, but I'm already certain it'll work in my area since already tested it on other devices.
Not sure if it's possible to unlock the R800at through Sony website method though.
I'm using the $30 100min and 5gb T-Mobile plan, usually keep an extra $10 deposited which give an extra 100min, and using the Vonage app to make free outgoing VoIP call.
Sent from my R800x
*Edit Note: R800i do not work on ATT nor T-Mobile 3G!
eksasol said:
There's a list of current locations where T-Mobile support the 1900MHz band, you'll have to check it to make sure you're in one of those area, and to be on the safe side, not on the edge but within the city zone. http://www.androidcentral.com/tags/t-mobile
I live in Miami which is one of the supported location so I did exactly that. I cancelled my LG Nexus 4 preorder since it's taking a long time to ship and bought an R800i, talk about vast gap in performance. I will report on it once it get here, but I'm already certain it'll work in my area since already tested it on other devices.
Not sure if it's possible to unlock the R800at through Sony website method though.
I'm using the $30 100min and 5gb T-Mobile plan, usually keep an extra $10 deposited which give an extra 100min, and using the Vonage app to make free outgoing VoIP call.
Sent from my R800x
Click to expand...
Click to collapse
My brother works for HP, but knows the Utah state Region Director. (Southern ID, and UT) With the deal I would be able to get a plan with 5 lines, 3 with 500 minutes and up to 5gb of data on each, then 200 minutes on the last two phones with only 200mb of data. As it would only be my wife and I, we would be able to set it up for about $45 for both phones with the 500 each, and 5gb of data for about $50-55 a month. Currently we are paying $120 a month for VZ and its service blows.
Yes, currently where I live there is no converted 2G from T-Mobile but eventually it will roll out. I am pretty sure I can live with 2G until its converted, couldnt be any slower then VZ where I live (50-70kbps)
Did some digging, this is T-Mobile USA's spectrum chart for 2G
850 MHz/1900 MHz GSM/GPRS/EDGE/UMTS/HSPA 2G/3G
1900 MHz UMTS/HSPA/HSPA+ 3G/4G
AT&T Spectrum
Frequencies used on the AT&T Network
850 MHz GSM/GPRS/EDGE 2G
1900 MHz GSM/GPRS/EDGE 2G
850 MHz UMTS/HSPA 3G
1900 MHz UMTS/HSPA 3G
I realize that T-Mobile service is again, subjective, but I really do love this phone and despite borrowing a S3 for about a week, and a couple other phones, I really just dont have a strong desire to jump to another phone. I really enjoy this phone for what it was designed, gaming. And each time i use a a phone to play touchscreen gaming I want to scream.
On a side note, the Region Director did mention that he estimate sometime between second to 3rd quarter of next year where I live we should go live on the 2G conversion.
Actually 2G atleast on T-Mobile is more like average of 20-30kbps, at least from my experience. You will be able to use email and xda app, and slow webbrowsing, and Google Maps. Downloading apps from the Play Store is out of the question unless its small or you want to wait long.
Edit Note: Actually the speed is faster at 80-100kbps after speedtest.
I was considering rebuying the unlocked version of the S3 as well because of this 1900mhz support, but then there is a thread in its forum with tons of people S3 having hardware death.
Sent from my R800x
eksasol said:
Actually 2G atleast on T-Mobile is more like average of 20-30kbps, at least from my experience. You will be able to use email and xda app, and slow webbrowsing, and Google Maps. Downloading apps from the Play Store is out of the question unless its small or you want to wait long.
Sent from my R800x
Click to expand...
Click to collapse
As I am always around wifi, at home and or at work (I work about 60 hours a week) I dont generally download from the PLAY store via 3G. And its not VZ's terribly slow data that driving me nuts its their service, I have had so many dropped calls, my wife too (Droid X)
But I guess what I am asking is, when the conversion is completed in my area, would I then be able to have 3G on this device? I guess we wont know for sure until it happens, but again T-Mobile did start converting it to give unlocked iphones on their service 3G.... and to free up spectrum for the planned rollout of their own LTE network.
I will let you know when I get my R800i in a few days, but I'm pretty certain of it. Many people have been utilizing this such as ATT iPhone owners and T-Mobile 3G worked on my Samsung Captivate.
Edit Note: Found out the R800i do not work with ATT nor T-Mobile 3G, but an unlocked R800at does.
Sent from my R800x
eksasol said:
I will let you know when I get my R800i in a few days, buy I'm pretty certain of it. Many people have been utilizing this such as ATT iPhone owners and T-Mobile 3G worked on my Samsung Captivate.
Sent from my R800x
Click to expand...
Click to collapse
You mention R800i. While I am looking at the R800at. Should I be looking into the R800i rather then the R800at for T-Mobile in the USA?
Also any feedback you can provide when you get your R800i would be appreciated.
Here is whats listed as the bands for the R800i:
Band
GSM 850/900/1800/1900 (Quadband)
So guessing that with those bands in mind I should be looking into the R800i if I want to utilize T-Mobile USA's 3G network, and perhaps even maybe their 3.5...?
Actually the bands you listed are GSM bands, GSM are 2G.
The 3G bands for ATT and on the R800at are: 850/1900/2100MHz. Either having 850 and/or 1900 + 2100 support will get you 3G.
For T-Mobile, 3G bands are: 1700/2100 (known as AWS or UMTS). Some area have support for 1900 like we discussed. This is where the interlap come in and where unlocked phones that support 1900/2100 bands can get 3G on both T-Mobile and ATT.
There are different levels of 3G, the coverage area might be different. Lowest level usually is UMTS, have the widest coverage and use less battery, but slowest speed, I usually get an average of 3Mbps. Then there is HSPA and HSPA+, which have a large range of speed depending on the version (check Wikipedia). T-Mobile have Dual Cell HSPA which have theoretical capability of 42Mbps, but realistically you will get half of that, and not all devices support it, I get up to 26Mbps with this, outdoor and close to the cell tower of course. From experience, I find T-Mobile obviously have faster 3G speed, but sometimes poorer building penetration.
The Play support: HSDPA 7.2Mbps and HSUPA 5.76Mbps, so that's the max speed this device will be getting on 3G.
You can check the device specs on gsmarena.com for bands support, but they are not always accurate so beware.
This is also why I recommend Nexus phones, because the last two Nexus are pentaband 3G devices, which mean they can get 3G on every GSM carrier in the world. There are few pentaband devices and fewer good pentaband phones.
Well I got my R800i, but disappointingly it doesn't get 3G with T-Mobile, but I checked the spec again and it seem the R800i only support the HSDPA 900 / 2100 bands, I didn't realize this sooner since all other international phones I have bought do support the 1900 band so I just assumed.
But the AT&T version do support the 1900 / 2100 bands, so I'm still confident if you buy that version and figure out how to unlock it, you will be able to get 3G on T-Mobile in the 1900MHz supported areas.
I did a speedtest of the 2G speed and I get around 80-100kbps download speed. So about 10kilobytes per second.
Side note, on the dialer, you can dial: *#*#4636#*#* which will bring you to a menu where you can set which band the phone will use, although it is labeled by region (you'll have to press the Menu button to bring up the option).
eksasol said:
Well I got my R800i, but disappointingly it doesn't get 3G with T-Mobile, but I checked the spec again and it seem the R800i only support the HSDPA 900 / 2100 bands, I didn't realized this sooner since all other international phones I have bought do support the 1900 bands so I just assumed.
But the ATT version do support the 1900 / 2100 band, so I am still confident if you buy that version and figure out how to unlock it, you will be able to get 3G on T-Mobile in the 1900MHz supported areas.
I did a speedtest of the 2G speed and I get around 80-100kbps download speed. So about 10kilobytes per second.
Side note, on the dialer, you can dial: *#*#4636#*#* which will bring you to a menu where you can set which band the phone will use, although it is labeled by region.
Click to expand...
Click to collapse
Thank you for the info and thank you for clarifying.
Sent from my R800x using xda premium
So after that I went on ebay looking for an unlocked R800at. Found one, not great price, but it was at a pawn shop 1.5miles from my house so I picked it up.
Here are the results: (see attached images).
Somethings I found:
-You have to search for the network operators and select specifically the 3G T-Mobile network. Might need to manually enter the APN for data/mms to work.
-With stock AT&T rom, I only seem to see the phone switching between E (2G) and H+. Since HSPA+ coverage isn't as abundant and you might see the signal deteriorate quickly depending on your location coverage. Edit: I see the 3G and H logo with R800i rom, may be it was just cosmetic?
-With stock AT&T rom, I can't seem to log into Google's Market at all regardless with Data or WiFi while using the T-Mobile sim. Maybe a limitation ATT specifically put in? But this is no problem after flashing another rom.
-As expected, Bootloader Status: Not_Rootable. So I can not get into fastboot mode meaning it require the test point method to unlock the bootloader. Still, I can easily flash the R800i ftf which will allow the NXT rom to be bootable (the ftf that work for me is the R800i_4.0.2.A.0.58_Enhanced). Then root it using "SuperOneClick", had to use x-Parts's CWM installer version 5 to correctly install cwm.
Still will have to fiddle with it more to see what else I can find. As for the R800i I will have to suck up the 15% restocking fee.

			
				
chery2k said:
I have the R800a on T-mobile USA and im stuck on Edge which is 2g. If you want 4G or 3.5G for your play your stuck with At&t otherwise if you go to t-mobile usa your stuck with 2g on your R800at the same boat as me.
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Click to collapse
How did you unlock it for use with t-mobile? I searched the forums to no avail. The only way I can find is to use a code you have to buy or you have to request through at&t and I don't have at&t so they won't provide me with one.
I can find ways to unlock the bootloader... is that the same thing?
Sorry I'm not familiar with sony ericsson
blu422 said:
How did you unlock it for use with t-mobile? I searched the forums to no avail. The only way I can find is to use a code you have to buy or you have to request through at&t and I don't have at&t so they won't provide me with one.
I can find ways to unlock the bootloader... is that the same thing?
Sorry I'm not familiar with sony ericsson
Click to expand...
Click to collapse
With the code your thinking of the sim unlock. Which you can get from AT&T, if you want the bootloader unlocked you need to get in touch with Alejandrissimo to unlock it... its a free service he offers.
Check you PM

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