Develop Bugs

Read this before you ask questions about phone versions/ supported fequencies.

So basically I got fed-up with seeing so many questions about TP2 models and their supported frequencies.
I'm an American so most of this information is geared towards helping other Americans- but it may also be of use to people in other parts of the world.
If you aren't a big tech-wiz, READ THIS before you buy your Touch Pro 2.
Here is the low down:
There are two different prominent cell phone technology standards in the world today: GSM and CDMA.
Most of the world runs their 3G cellular networks on GSM. However some carriers such as Verizon, Sprint, Bell, and Telus work on CDMA.
GSM= Sim Card
CDMA= No sim card
-Note however that CDMA "world phones" have sim cards because they also include GSM tuners.
Here are the Mobile Telecommunications Standards that matter to you:
GENERATIONS:
1st Generation (1G):
~don't worry about it, only primitive cell phones operated on this standard.
2nd Generation (2G):
~here we go this is GSM!!! This is what matters
~this is also where current CDMA networks really started rolling out.
2.5G:
~EDGE, this is the GSM that you use if you aren't on 3G. EDGE is important, memorize the name!!!
3rd Generation 3G):
~now we are talking, UMTS (Universal Mobile Telecommunications System). In Europe UMTS may also be called "W-CDMA" although it is GSM (sim cards!!!) This is 3G that the Iphone was named after. It is GSM.
~EV-DO (Evolution Data Optimized), this is the 3G of CDMA. this has revisions such as EVDO rev "A" or "B" that can be considered 3.5G
3.5G:
~HSPA (High-Speed Packet Access)= HSDPA/HSUPA. The "D" in HSDPA stands for downlink, the additional "U" in HSUPA stands for uplink.
~ EV-DO revisions.
4G:
~LTE, blazing mobile broadband. This is GSM and what most of the world is migrating to, EVEN CDMA carriers.
~WiMAX. No sim card, because it is not a GSM technology. Think of it like Wi-Fi on steroids. Compare it to LTE like we can compare HSPA to EV-DO today. Understand WiMAX now?
Whew, now that we have all the standards explained, lets talk about what this means.....
DON'T BUY a phone and expect to get 3G on it UNLESS it SPECIFICALLY states that you can get 3G for your carrier on it.
Some common hints:
"European Version"= 3G for many carriers in Europe, EDGE everywhere else, nothing at all for CDMA.
"World Phone"= a CDMA phone that is also capable of GSM. Only capable of 3G (EV-DO) on the carrier that the phone is branded for. Will work on EDGE everywhere else for GSM carriers.
"US Version"= a GSM phone that works on AT&T's 3G network but NOT T-mobiles.
~~Phones that you buy from your carrier will work on your carrier's 3G bands. (Unless your carrier doesn't have 3G yet in your area)
JUST BECAUSE A PHONE SUPPORTS THE SAME BAND DOES NOT MEAN THAT YOU CAN GET 3G ON IT.
MANY 3G BANDS ARE SHARED, BUT ARE SLIGHTLY DIFFERENT. This means that even though carriers such as T-Mobile and AT&T share bands, the phones that support 3G on each are not interchangeable with carriers. EDGE, on the other hand, works interchangeably.
Lastly, 3G support and other wireless standard compatibilities have nothing to do with the software of your phone. You will never find a magic ROM that will enable 3G on a carrier that does not support the phone. It is all HARDWARE DEPENDENT.
Questions?
Also if you need more information, read the posts after this one. There are lots of smart people on xda-developers. I'm sure some will write additional information, clarify, or even correct something that I wrote.

somebody should sticky this, its useful for newcomers

skyler17 said:
2.5G:
~EDGE, this is the GSM that you use if you aren't on 3G. EDGE is important, memorize the name!!!
Click to expand...
Click to collapse
Not necessarily true. EDGE can actually technically be classed as 3G (though it almost always sits in the higher end of the 2.5G tier). 2.5G would more correctly refer to GPRS rather than EDGE, with EDGE being more of an enhancement to GPRS.

skyler17 said:
. . . .
Most of the world runs their 3G cellular networks on GSM. However some carriers such as Verizon, Sprint, Bell, and Telus work on CDMA.
GSM= Sim Card
CDMA No sim card
Click to expand...
Click to collapse
When it comes to PDA/WinMo phones "CDMA = No SIM card is false". There are actually a couple of CDMA phones with SIM cards including the Touchpro2.

HSPA is a catch all name for HSDPA and HSUPA, 3.5G techs.
The 3G implementation is UMTS.
If you are talking about worldwide use, EDGE is pretty much not used in the UK... O2 have it on a couple of base stations but its extremely rare, so here you just get:
1G - Analogue phones, Vodafone and O2 had analogue networks but they are now shut down.
2G - GSM with CSD (Circuit Switched Data - make a phone call for data) and HSCSD (High Speed Circuit Switched Data - basically make multiple phone calls and bond them, was only availible on Orange). O2 and Voda use both 900MHz and 1800MHz. Orange and Tmobile have no 900MHz license and use just 1800MHz. 3 Do not operate a 2G network and these days use Orange for coverage where they don't have their own network, they used to use O2...
2.5G - GPRS (General Packet Radio Service) This is the lowest speed you'll get on any network now, up to about 115kbps, on all four 2G networks, indicated by a G on the screen near the signal metre.
2.75G - EDGE (Enhanced Data Rates for GSM Evolution) initially capable of 236kbps, only O2 ever did anything with it, and they did very little with it, for all intents and purposes it is unused in the UK.
3G - UMTS (Universal Mobile Telecommunications Service). This is what is known as 3G in the UK. It uses WCDMA - yes, it is CDMA based, not TDMA as 2G GSM is. Capable of 384kbps, this is needed for video calls (which all UK networks support). Indicated by a 3 onscreen, all UK towns and cities are covered by this or better these days by all networks (advantage of a small country with dense population). All 5 big operators have 3G licenses. At the moment 3G means 2100MHz, Ofcom want to have some of Voda and O2's 900MHz allocation back and allow 3G on it. High frequencies mean short range, making the current band good for getting alot of transmitters (and hence capacity) in cities, but crap for covering rural areas with 3G, you need too many transmitters for cost effectiveness. If Ofcom reallocate some of the 900MHz band and allow 3G on it, it could massively improve 3G reception in rural areas.
3.5G - HSPA (HSDPA and HSUPA). Up to 14.4mbps down (Voda in trial at this speed) other networks 7.2mbps and 3.6mbps. Indicated by a H on screen. Will see this in most major towns and cities.

Say you have an European TP2, which, as we know, does not support AT&T's 3G. Will it support US HSDPA?

dementio said:
Say you have an European TP2, which, as we know, does not support AT&T's 3G. Will it support US HSDPA?
Click to expand...
Click to collapse
Nope, its all or nothing. Even though it supports the downlink band, since it is missing the uplink band it will not support US 3G.
It will give you EDGE however.

[Q] Why does the ZF2 switch from LTE to 3G whenever I make a call?

Whenever I try to make a call using the default phone app on my ZF2, it always switches from an LTE connection, to H+/H, then settles on 3G, and also causes a delay in dialing. I'm currently using this on T-Mobile (USA), and I know T-Mobile supports VoLTE (HD Voice). Is this an issue of the ZF2 not supporting the band for VoLTE? (also is it possible to at least keep the call on H/H+ rather than 3G if the ZF2 doesn't support VoLTE)
I have the ZE551ML, 4GB RAM, 2.3 GhZ model.

itechnoguy said:
Whenever I try to make a call using the default phone app on my ZF2, it always switches from an LTE connection, to H+/H, then settles on 3G, and also causes a delay in dialing. I'm currently using this on T-Mobile (USA), and I know T-Mobile supports VoLTE (HD Voice). Is this an issue of the ZF2 not supporting the band for VoLTE? (also is it possible to at least keep the call on H/H+ rather than 3G if the ZF2 doesn't support VoLTE)
I have the ZE551ML, 4GB RAM, 2.3 GhZ model.
Click to expand...
Click to collapse
Its is not your phone. It is your carrier(T-Mobile). I have had the same issue with T-Mobile but did not have with at&t on the same unlocked phone. Kinda weird when it happens but doesn't seem to effect anything.

Recommend using ZenUI app called ASUS support/ There are several helpful tips with basic troubleshooting techniques for your device including 3G/LTE signal issues.
For online support please see ASUS ZenFone Quick Service and FAQ:
http://www.asus.com/us/support/self-service/11/
http://www.asus.com/us/Phones/ZenFon...esk_knowledge/
Sincerely,
ASUS_USA

As of now, phones must have software support for VoLTE, which only a few do. The ZF2 does not, that I know of.

dicktuggnutz4 said:
Its is not your phone. It is your carrier(T-Mobile). I have had the same issue with T-Mobile but did not have with at&t on the same unlocked phone. Kinda weird when it happens but doesn't seem to effect anything.
Click to expand...
Click to collapse
Let me reply, I'm working with telecom for 5 year plus and have been dealing elements of 2G > 3G >4G.
your scenario is actually one of the test cases during UAT( user acceptance testing), these test case are scenario based so from here i could say is that.
Your carrier may or may not support LTE call OR the counterpart may not have LTE call in (phone OR network).
This works by,
4G to 4G > depending on network ( if both carrier has VOLTE)
a) if both carrier has VOLTE( voice over LTE), assuming both phone are LTE enable phone then you shall stay onto 4G network and call should be packet based transmission
b) if both carrier has VOLTE assuming either phone does not have LTE enable, then you shall drop from 4G to 3G in order to support the call function of the other party
c) if both carrier has VOLTE assuming that either phone does not have the feature of attaching to LTE during call, it will drop to 3G network because phone is not designed to perform 4G calls. ( look at Xiaomi Redmi, similar scenario but 2G and 3G, during call, 2G call slot pick up and 3G is dropped)
TLDR: either your phone does not support simultaneous 4G call or the carrier does not support VOLTE.
Oh... most European and US telco is slower then asia's network, so they might not have VOLTE or currently test stage. 3GPP stated that by 2017, 2G network shall crease and everything build base as 3G hence 4G network is a must.
---------- Post added at 06:58 AM ---------- Previous post was at 06:53 AM ----------
sooty84 said:
Let me reply, I'm working with telecom for 5 year plus and have been dealing elements of 2G > 3G >4G.
your scenario is actually one of the test cases during UAT( user acceptance testing), these test case are scenario based so from here i could say is that.
Your carrier may or may not support LTE call OR the counterpart may not have LTE call in (phone OR network).
This works by,
4G to 4G > depending on network ( if both carrier has VOLTE)
a) if both carrier has VOLTE( voice over LTE), assuming both phone are LTE enable phone then you shall stay onto 4G network and call should be packet based transmission
b) if both carrier has VOLTE assuming either phone does not have LTE enable, then you shall drop from 4G to 3G in order to support the call function of the other party
c) if both carrier has VOLTE assuming that either phone does not have the feature of attaching to LTE during call, it will drop to 3G network because phone is not designed to perform 4G calls. ( look at Xiaomi Redmi, similar scenario but 2G and 3G, during call, 2G call slot pick up and 3G is dropped)
TLDR: either your phone does not support simultaneous 4G call or the carrier does not support VOLTE.
Oh... most European and US telco is slower then asia's network, so they might not have VOLTE or currently test stage. 3GPP stated that by 2017, 2G network shall crease and everything build base as 3G hence 4G network is a must.
Click to expand...
Click to collapse
and with that, our phone shall be non dual sim by 2017 onward which sucks.
it means that carrier will no longer allow BTS to attach 2G signal to BSC > MSS > circuit core.
so.... that slot is basically useless........ now.. lets wait for dual sim 3G/4G! perhaps zenfone 2^2

VS986 to use band 5 LTE abroad.

I meant to use band 5 lte in indonesia with smartfren using vs986. I used shortcut master lite app to enable band 5 (and/or disable irrelevant lte bands). However i still cant connect to it. I am certain that my location is under that lte band 5 coverage given that when i used other gsm sim i could see the network and attempt a registration on the network. Furthermore, seeing the networks rat id also match with the information online that it is indeed a band 5 lte network. However when i pop in the band 5 lte network gsm sim card, i am no longer able to scan for networks, it just fails to scan everytime, thus i cant connect. I wonder if there is a workaround to make vs986 able to connect to other lte networks other than verizon.
P.s. im on slim 13b rooted/xposed.

It's not just the bands. Verizon really borked the firmware of the phone to make sure that it doesn't work on any other 4G LTE network than its own. For instance, it doesn't work on AT&T and T-Mobile LTE network in the US either, even though the bands are supported.
What you can try is to switch the phone to "LTE/CDMA" mode in the "Network mode" settings. This will probably kill your phone connection, but if you get 4G LTE then, then you can try the same hack that worked for T-Mobile: http://forum.xda-developers.com/verizon-g4/general/guide-fix-vs986-dropping-to-3g-h-4g-lte-t3272434
But on some networks, there is no hope, for instance nobody was able to get it to work on AT&T.

I think i did check that thread out when i used t-mobile for about 6 months in seattle/udistrict/uvillage/uw areas, with no success. I never got the LTE connection. I wonder maybe its related to different roms/kdz/flashfire modified version of 13b that cause it. I hope someone whos lucky enough to get lte might share info about their 13b version/softwares that you debloat using debloater or froze using tibu. Thanks.
P.s. it was on 4g for an instant before it gives me no signal/network.

Why would VZW disable B5 if they have B5 sites?
That would really be stupid.
Posted using a calculator and delayed by AT&T.

LTE 2/4/5/13 can be activated using Shortcut master lite. The problem is that, when i used a simcard that utilized LTE band 3/8, i could detect/attempt registration to signal from LTE band 5 from local network through GSM (given that i activated it). However when I used simcard for that LTE band 5 network, somehow, i can no longer use gsm/cant search for network/crashed. It seemed that LTE antennae on this device is programmed to only accept verizon's. (For lte networks, apns are saved when i put MCC/MNC or RAT for verizons, but discarded when i put other). Thank god though i could still use umts/3g.
Edit: So i tried again. Turns out, i could to get registered on the network, checked on network type and strength (says 4g - 3/4 bars) also on lte discovery says connected. However signal bars says unable to connect to network. Verizon definitely prevent users to use lte on another network. What a **** company.

this is from Verizon website them self
Network
CDMA, GSM, LTE*
Frequencies
1.9 GHz CDMA PCS, 800 MHz CDMA, GSM 850/900/1800/1900 MHz, LTE 2/4/5/13, LTE 3/7 for Roaming*
which show it support band 3 in case of romaing only..but if you are in USA will not work sure as it is not romaing.

Issue connecting to 4G

So a mate has a P2 and can't seem to get it to connect to 4G. The SIM card and network is Vodafone UK.
What I know/have tried:
- SIM in both sim slots will connect to 3.5G (HSDPA) on Vodafone network
- A different SIM (Three UK) did connect to 4G in the SIM slot 1 (did not try SIM slot 2)
- Settings says 4G preferred network is selected
- By typing *#*#4636#*#* into dialer and going to phone info displays LTE is selected as one of the preferred networks
- The same SIM (Vodafone UK one) connects to 4G in his old phone and has done in all his old phones
- APN settings are correct, verified by Vodafone support plus myself looking online
So he talked to Vodafone support again today who said try speed tests in 3 different locations and report back. He has done 1 which is 14mbps down and 3mbps up which is slow for 4G (I get 64mbps down and 24mbps up, different network but shows his is slow and likely not 4G). Similarly we we know the device can connect to 4G from using the Three UK SIM.
My gut instinct is it's a network issue, all device settings seem okay, nothing is screaming out of place. The issue though is that the SIM has connected to 4G in his other devices so confuses me.
So, I'd love your thoughts and inputs on this. Any suggestions welcome that may help! Thanks!

matt4321 said:
So a mate has a P2 and can't seem to get it to connect to 4G. The SIM card and network is Vodafone UK.
What I know/have tried:
- SIM in both sim slots will connect to 3.5G (HSDPA) on Vodafone network
- A different SIM (Three UK) did connect to 4G in the SIM slot 1 (did not try SIM slot 2)
- Settings says 4G preferred network is selected
- By typing *#*#4636#*#* into dialer and going to phone info displays LTE is selected as one of the preferred networks
- The same SIM (Vodafone UK one) connects to 4G in his old phone and has done in all his old phones
- APN settings are correct, verified by Vodafone support plus myself looking online
So he talked to Vodafone support again today who said try speed tests in 3 different locations and report back. He has done 1 which is 14mbps down and 3mbps up which is slow for 4G (I get 64mbps down and 24mbps up, different network but shows his is slow and likely not 4G). Similarly we we know the device can connect to 4G from using the Three UK SIM.
My gut instinct is it's a network issue, all device settings seem okay, nothing is screaming out of place. The issue though is that the SIM has connected to 4G in his other devices so confuses me.
So, I'd love your thoughts and inputs on this. Any suggestions welcome that may help! Thanks!
Click to expand...
Click to collapse
I dont know the device or network specifically But I know that the device has to support the same lte bands that the carrier broadcasts in LTE in that area Just because the carrier broadcasts say 900mhtz in LTE, if the device dont support 900 in lte then it wont get it. I have had cases wher 3g is the same freq as 4g it still wont pick it up If you get what I am saying. May be a issue or not.

to further add he might take one of the old devices and use a signal catching app to see what lte bands are broadcasted in his area then compare to device

Thanks @TheMadScientist, all suggestions welcome still. I'm gunna continue to keep an eye on this, research answers and send him a link to this so he can test anything on the device.

matt4321 said:
Thanks @TheMadScientist, all suggestions welcome still. I'm gunna continue to keep an eye on this, research answers and send him a link to this so he can test anything on the device.
Click to expand...
Click to collapse
We get this issue a lot using sprint phones unlocked international gsm. A lot of carriers seem to not use the same lte bands.
Then naturly verizon devices come gsm unlocked but verizons radios are crap and do not pick anything up half the time. My veriz g5 can get lte next town over cause they use a supported band and no towers near me use it. So i get 3g. And a lot of h h+ i ise lte discovery as the app on mine.
Just hope this isnt his issue as its a harware compatibility .

TheMadScientist said:
We get this issue a lot using sprint phones unlocked international gsm. A lot of carriers seem to not use the same lte bands.
Then naturly verizon devices come gsm unlocked but verizons radios are crap and do not pick anything up half the time. My veriz g5 can get lte next town over cause they use a supported band and no towers near me use it. So i get 3g. And a lot of h h+ i ise lte discovery as the app on mine.
Just hope this isnt his issue as its a harware compatibility .
Click to expand...
Click to collapse
So I checked the network and the device (on GSM arena) and it seems 4G bands are supported. But I'll try that lte discovery app with him soon you mentioned and see what results that yields

@matt4321
http://www.techadvisor.co.uk/how-to...r-phone-is-supported-by-your-network-3597426/
You should check the manuals if there is support for 2600 frequency on phone.
Maybe the phone supports 800/1800(cos 3 is on 1800) and you don't have 800 band in area.
You will have to contact Lenovo and ask them to change baseband or whatever...
or Perhaps get a new phone with support for 2600

Had the same problem using a LG G3. I tried this App to trigger LTE only. Then the Phone connect to the LTE network.
https://play.google.com/store/apps/details?id=com.tapbase.LTEswitcher&hl=de

Freedom Mobile and ZTE Blade V8 Pro

I am helping a friend who uses Freedom Mobile in Canada to find a new phone. We bought the ZTE Blade V8 Pro. The phone arrived and the phone picked up the 4G LTE internet. It also works in streaming videos over LTE on Freedom. So internet works. Texting also works.
However her phone was not able to make nor receive any phone calls. I tried clearing the cache and resetting the phone, but the problem persists.
I tried to manually set the APN settings. No luck.
I tried to search for the networks. I was only able to see Home 4G. But there is no Home 3G. Is this why the internet LTE works, but not phone calls?
What is going on here? GsmArena said this phone is fully 3G 1700 AWS compatible.
https://www.gsmarena.com/zte_blade_v8_pro-8504.php
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 850 / 1700(AWS) / 1900 / 2100
4G bands LTE band 2(1900), 4(1700/2100), 5(850), 7(2600), 12(700)
Even ZTE's website says the same thing.
https://www.zteusa.com/blade/
MODES
GSM: 850/900/1800/1900 MHz
UMTS: 850/1900/AWS/2100 MHz
LTE: B2/B4/B5/B7/B12
Freedom's website also said both IMEI numbers are compatible, on the IMEI check. (This phone has 2 IMEI's.)
https://www.freedommobile.ca/plans-and-devices/bring-your-own-device-to-freedom1
Your phone is compatible.
If your phone is unlocked you can get started by signing up for a plan today!
The following network services will be supported:
HSPA+
LTE Advanced
Please note: Certain versions of older handsets may not have the ability to select the ‘LTE Preferred’ in the phone Network Mode settings even if the hardware supports the particular band. These handsets will not be able to connect to any LTE network.
See Coverage Map
Phone Information:
IMEI number: XXXXXXXXXXXXXXX
Brand name: ZTE
Model name: Z978

Could be an issue with VOLTE not being supported on that carrier. If data and text works but not voice Im guessing theyre in an area only covered by a certain band.

An update: My friend switched to Chatr.
She went to a Freedom booth. The Rep told her that just because it is listed as compatible on the Freedom Website, it doesn't mean that phone is fully compatible. In the case it only works with Freedom 4G and not 3G. And Freedom 3G is required for calls. 4G is only for internet and text.
My friend obviously was upset. Firstly this phone is supposed to be fully AWS 3G 1700/2100 compatible. All our research shows that it is. I am not sure if this is ZTE mis-advertising, or Freedom has compatibility issues even within their own AWS 3G. Secondly when a phone is listed as compatible on Freedom's website, it better be fully compatible.
This is BS on many levels. And I say this as a fan of Freedom.
She went right over to Chatr and switched to their $40 for 2.5GB plan.
Either way if you are a Freedom user, I say stay away from the ZTE Blade V8 Pro. It probably won't work.
In the future get a popular phone with lots of people saying "Yes it works" before buying a phone for Freedom.