Develop Bugs

[Q] Why Does my Korean N7100 think I'm roaming and not connect to mobile internet?

I bought my n7100 on taobao here in China, and it's a Korean version. I put my China Mobile sim card in, and it makes and receives calls, and text messages and can use wifi with no problem.
The only thing is the mobile data doesn't work. I rooted and tried tweakker, and HiNet, to reset my APN and MMS settings, but that didn't work. My phone still thinks I'm roaming.. it displays
this message "Data Roaming, You have lost data connectivity because you let your home network with data roaming turned off".
I've also tried updating the APN and MMS settings manualy with information i've found on the web.
I've googled and searched this forum and I can't find much. I thought it would be an easy APN settings fix but it seems not to be...
I took my phone in to the local China Mobile store they couldn't fix it. I took it to a local android expert here and they didn't know what to do.
Any ideas would be greatly appreciated.

If you bought a Korean Note 2, you don't (shouldn't) have an N7100. I also purchased one through Taobao.
You should have an SHV-E250S, E250L, or E250K. Which one do you have? Check the baseband version under Settings > About device page.
No matter what, you're going to be limited to 2G only with China Mobile.

You're right, It's SHV-E250S, and I'm fine using the 2g in China on China mobile, but I'd just like to know how..any help?
Baseband Version is E-250SKSVLJK

Try removing all modifications to your APN settings.
Next, go into Settings > More settings > Mobile networks > Network mode and change it to GSM only. Also make sure that Data roaming is not selected. Run a new scan for network operators while you're in there to refresh your APN settings to the right ones.

In data network mode I only have 2 options "3g only" or "LTE Preferred" I have it on 3g only. I have now unchecked data roaming, but I don't see any place to scan for network operators. I have included a few screenshots here, sorry i don't know how to insert them.. http://tinypic.com/r/2198djn/6 http://tinypic.com/r/24dhfmx/6 http://tinypic.com/r/2zof98w/6

Now it's obvious why you don't have data. Is this the stock Korean ROM? Are you rooted?
I can point you to a decent ROM that will fix all of this, provided you have the patience to fix it. It's relatively easy.

Yes it seems to be the stock Korean ROM. I am rooted using http://forum.xda-developers.com/showpost.php?p=31801060&postcount=2 I'm more than willing to flash another rom. I've put about 20 hours into this so far, I imagine I can muster enough patience to finish it

Once they give us a damn Korean Note II section, this kind of information will be a lot easier to find.
Try this ROM for now, it's the one I've been using for a few weeks and I love it.
Link source: http://koxda.com/thread-98683-1-1.html
ROM Download: http://pan.baidu.com/share/link?shareid=149494&uk=3355956772
Password: koxda.com

Thanks a lot the rom (715mb) is downloading now, I have tried to flash ROM's on my old galaxy nexus, and on this note II, but I never succeeded, can you please link me to a good guide, on how to flash this rom? thanks.

Odin is included in the download. If you're using Windows 7 you may or may not have the drivers for the phone, and can grab them out of the All-in-one Toolkit. Just installing the toolkit should install the drivers necessary.
http://forum.xda-developers.com/showthread.php?t=1923956
The ROM you're downloading has two files and two pictures, as well. Open the pictures and follow along. All you have to do is click two buttons, select two files, then hit start. It WILL wipe your phone.

I installed that rom you suggested, I went into settings and did GSM only, and had it automatically find my network (china mobile) selected it, rebooted, and still it says i'm roaming so there is no connectivity... any more ideas?

Can you try somebody else's SIM?
There's no reason you should not be getting service unless something is not right with your SIM or phone.

I installed the rom you suggested, i went into settings and made it GSM only, also had it automatically correctly locate my network (china mobile) and it said "registered on network".. but it still isn't working, same problem, it says no connectivity cus i'm roaming.. any ideas now?

my gf will be home from work in a couple hours, I can try her sim card then.. my sim card was cut by me for my old iPhone.. is it possible or likely that the phone can still make and receive calls, but that somehow data connectivity was affected by me cutting the card? also one guy at the phone fixing store tried his sim card (from another company) and internet worked fine he said..

dadroidda said:
I installed the rom you suggested, i went into settings and made it GSM only, also had it automatically correctly locate my network (china mobile) and it said "registered on network".. but it still isn't working, same problem, it says no connectivity cus i'm roaming.. any ideas now?
Click to expand...
Click to collapse
China mobile have various sim plans, from local to province to national. Are you using the sim in the same city in which you bought it? If not and you don't have a national plan, it could be why the phone is showing roaming. In China going from one province to another is already considered roaming unless you have a national plan. This is from my experience back 2 years ago. Also, you best check at a China mobile shop if you have data activated, gprs/edge is not activated by default, you need to ask them to do it.
I would advise you to switch to China unicom as they have 3g/hspa which is much faster than china mobile.
Sent from my GT-N7105 using xda premium

For clarfication, I am in Hainan, and the card is from hainan. I use the same sim card in my galaxy nexus without any problem. I tried my gf's card just now, it didn't say any problem with connectivity, and did not display roaming.. And it shows the G symbol (for 2 or 3 G I assume), and has up and down arrows next to it.. but it doesn't actually work for browsing the web or using apps over the data network.. I even reset all the APN settings and let it automatically find the China Mobile network, but it didn't help.. what if I try to set the APN settings manualy? and any other ideas??

Showing the G symbol is GPRS, which is 2G. You will not get 3G on the N7100, N7105, or Korean model Note 2 on China Mobile.
Sounds like you need a new SIM card. You can try to set the APN manually to make the data work with hers. I've never had to set an APN manually and I've used many phones here with all 3 carriers, so it's a bit odd to me. No clue why your card doesn't work, but since hers is working fine, it's definitely not your phone.

For the record, her card displayed G, but even after messing with settings, I couldn't get it to have working data network..
Today I bought a new card, and had it officially cut to size, put it in the note II and it's still telling me no data connectivity due to i'm roaming.. i'm so frustrated
edit: after restarting a few times and trying to automatically make it register on china mobile .. it worked on the 4th attempt.. it still displays data roaming, and I had to enable data roaming... but now it works, even though it says i'm roaming?? wtf

Ive the same problem with my Korean galaxy note 2 all voice service work perfect but when I tried to turn on data it says insert Usim Card to access network please help

No data during call after oreo update

Hello. I'm hoping that someone can help me out. I have a Verizon note 8 that i use on straight talk for the longest it never would update to oreo but then i cracked the screen and purchased another used verizon note 8 from ebay. It came to me with a cricket sim card in it. I turned it on and connected it to wifi just to check it out before i transferred anything and it immediately wanted to update so i let it and it updated to oreo. I swapped over my ST sim into the new phone and stuck the cricket sim into the old phone and it updated too. But now my problem is that I keep getting the message that data is unavailable during calls. When i check the settings it says i am on CDMA/EVEDO/GSM/WCDMA. And there is no option to edit my APN. If i click on the mobile network i have the option for LTE/3G/2G but if i choose this nothing works and i have no option to go back to the CDMA/EVEDO/GSM/WCDMA and thus have to do a factory reset. I have tried texting APN to 611611 but it states my APN is already setup. I called tech support for ST and they told me to call back from another phone which i cant do until this evening when i get off work. So i thought in the mean time i would reach out to the real pro's on here and see if anyone else has had this issue. Did i mess up by updating with the cricket SIM inserted? Or could it be that i just didnt call straight talk when i swapped phones? i just took the sim card out of one phone and stuck it in the other. I really appreciate any advice anyone may have. Oh and I've tried finding the settings for HD calling to enable them, not there.
Thanks,
Amy

I'm having this same issue with my Verizon branded note 8 that I manually updated to Oreo. I called my carried, Red Pocket and they stated that this is enabled for my account. In Oreo the hidden menus seem to be disabled and I've tried other things. I may have to see if I can go back to Nougat. The dialer hidden menu I tried was *#2683662#. On the Verizon forums, other were able to get to the menu using *#4636# and enable VoLTE but that seems to be disabled for me. I tested from my coworkers note 8 and it seems to work fine on their phone.

sixtythreechevy said:
I'm having this same issue with my Verizon branded note 8 that I manually updated to Oreo. I called my carried, Red Pocket and they stated that this is enabled for my account. In Oreo the hidden menus seem to be disabled and I've tried other things. I may have to see if I can go back to Nougat. The dialer hidden menu I tried was *#2683662#. On the Verizon forums, other were able to get to the menu using *#4636# and enable VoLTE but that seems to be disabled for me. I tested from my coworkers note 8 and it seems to work fine on their phone.
Click to expand...
Click to collapse
I reflashed CRID and the CSC but my Service Provider SW ver. still says VZW/XAA/VZW. Does anyone know how to fix this?

Has anyone figured this out? I am having this very issue and Straight Talk has no clue what I am talking about.

I found this on the Samsung website and it looks promising but nothing has changed. I was able to see that the radiobutton/checkbox for LTE Enhanced is checked.
To enable HD Calling, download Shortcut Master (Secret Codes) Lite from developer vndnguyen. You will need to find the apk as it does not appear to be in the play store any longer.
1) From the option menu located in the upper right hand corner, choose Search.
2) There is a search field at the bottom of the screen. Type lte then hit the Search key.
3) Scroll down to Mobile Networks. Choose the one that show EnhancedLteServices. Then click Launch. Then click the box to enable HD Calling.
I was also able to set the APN settings to Bearer: unspecified using Shortcut Master lite but this made no difference whatsoever.
Finally, you don't need to do a factory reset each time you go from CDMA/EVEDO/GSM/WCDMA to LTE/3G/2G (auto connect), simply search in settings for reset network and then reset the network settings and reboot.

I was able to get the SIM card trick to work for me on my Note 8 as well. I have redpocket and prior to doing the sim card trick I did not have VoLTE. Now I do. It's too bad that this is majorly inconvenient and it won't stick after a reboot, by the sounds of it. I haven't tried yet. I may just tape the sim to the back of my phone or inside my case. Also, on my Note 8 prior to this, I was seeing vzw/xaa/vzw and now it has the vzw/vzw/vzw CSC with the RP sim in. I'm hoping that there is another way to fix this but at least I have a work around.

I updated to Oreo on my verizon note 8.
I dont have any options for advanced HD Calling, Wifi calling.
When I go to ims settings it says denied.
Any ideas

dpoverlord said:
I updated to Oreo on my verizon note 8.
I dont have any options for advanced HD Calling, Wifi calling.
When I go to ims settings it says denied.
Any ideas
Click to expand...
Click to collapse
I answered you on the other thread just so know..

Can't connect to mobile network.

I have a pixel 3xl, up to date stock non rooted, on straight talk lte/cdma Verizon network. I got a text saying straight talk now has VoLTE so I tried to find it in settings but there's no option for it. When I search it it comes up but when I click it it goes to mobile settings and it's not there I did the *#*#4636#*#* and it's also grayed out there. I changed the network mode in that diag screen to lte/cdma to see if that helped, was on global before i think. Still no VoLTE and for some reason I can't make calls. I have data, can send and receive texts but when I go to call it says no network. Removed Sim card didn't fix it, restarted it. Safe mode doesn't help either. Tired clicking trigger carrier provisioning, updated the smsc. Change mobile network to lte only, back to global, lte/cdma. I have no idea what else to try. Straight talk is basically useless for customer service so I haven't even tried yet lol.

Update!! It works!! Somehow I either damaged my sim card when I switch from my pixel 2xl to this 3xl and it somehow lasted till now. Or when I changed my network settings something wrote to the sim?( And it messed it up?? IDK much about how the phone and sim interact with each other)... But I did have a 2 year old sim card, it did not have VoLTE or wifi calling capabilities I now realize. So I bought a new SIM card at Walmart and activated it though the straight talk app on my account and kept the same number. Works perfectly and I now have VoLTE, no wifi calling yet but the option is now there and lets me click it but it fails. Doesn't matter to me, I'm just happy to have VoLTE. I'm leaving this post because straight has horrible customer service and I could find anyone who ran into this specific issue.

A505U can't access Visible network

I've tried everything, so hopefully someone can shine some light into this issue.
I bought a new (unused but from a 3rd party) Samsung Galaxy A50 (A505U) Verizon branded and unlocked. Got a sim card from Visible and went to get it connected. Nothing. WiFi works, everything works, but no cell service.
Here's what I've done (some multiple times)
- reset everything to include network settings, hard reset, etc
- removing the sim, resetting, putting the sim back in. I always get a notification saying the sim card is removed and it goes away when I put the sim back in, so it is recognizing a sim card is in there
- switched sims with another Visible phone/sim and nothing. Both sims worked on other phone but neither worked on this phone
- tried getting into the hidden menus but none of them worked
- talked to Visible tech support which upgraded the issue to the highest level and concluded it's the phone
- Visible believes it's the APN settings but I cannot edit current APNs nor add new ones (grayed out)
- manually add networks, I can see Visible, TMobile, ATT, and some weird numbers, but when I try to connect to Visible it says cannot register on the network, other networks say the sim is not setup for them
- sometimes I get the icon that shows all bars but they're grayed out, sometimes it shows 3-4 bars lit up, sometimes even shows a 4G icon, but mostly the grayed out bars
- sent the phone to Samsung, they tested it and found no faults, guess the hardware is good, ruled that out.
- got into dev options but I'm aware the OEM unlock is not on option on the A505U, not sure if I can change anything else.
I'm out of options. Any other ideas? I think if I can either get into the hidden menus I'll be able to diagnose it better, or if I can somehow change the APN settings I'll be able to set it up. Visible tech support thinks it's the APN, which makes sense to me, but I can't change them.
Any help is greatly appreciated.

I was able to get into the CSC change function, there's not many there, but would changing the CSC help? If so, which should I go to?

I've had a similar issue. Was working fine until the Android 10 update arrived. Since then, it won't work with my total wireless sim card. Tried 3 different sim cards on it, but nothing. Can't add it do anything with the APN, and getting into the phone info hidden menu doesn't help any. I suspect it's a bug in the new firmware or something like that. Works fine with a Verizon SIM though.
Update: Verizon SIM no longer connects to phone. Still works with LTE data. It seems that the CDMA radio quit working with the update to Android 10. Must have been collecting to the Verizon network with VoLTE until it updated the provisioning or something.

So, I finally figured out a workaround for mine that was able to get both data and voice networks to connect while using total wireless, which is an MVNO on the Verizon network. I pretty much narrowed it down to being an issue with the modem not working with CDMA. What I did was download the last Android 9 firmware and flashed just the modem (file starts with CP_) using Odin. After that, I rebooted it and voila! It connected.

Just thought i would give my experience as i just delt with this. i got my 10 update this morning nd let it update and apon a reboot i lost all mobile connection, a signal bar would show for a few seconds looking like it was trying to lock in a signal and it would go back to the ⌀ symbol. i tried flashing the android 9 modem from 2 different updates and neither fixed it. i just decided to order a new phone as i feel its time anyways. my next attempt will be to flash android 9 back using odin then just throw this phone up on craigslist
edit: odin successfully flashed back to android 9 and signal now works again. so if anyone has this issue you can try the method above of just flashing the modem and if that doesnt work you can go back to 9 and restore functionality of verizon mvno's

darkmage1991 said:
Just thought i would give my experience as i just delt with this. i got my 10 update this morning nd let it update and apon a reboot i lost all mobile connection, a signal bar would show for a few seconds looking like it was trying to lock in a signal and it would go back to the ⌀ symbol.
Click to expand...
Click to collapse
Out of curiosity, which carrier are you using?

TJay99 said:
Out of curiosity, which carrier are you using?
Click to expand...
Click to collapse
Visible

samsung a50 not connecting to VZW towers (red pocket)
My phone is doing the exact same thing and while I can appreciate how you resolved the issue it doesn't make much sense to me.
I use Red Pocket for my network. (Which uses Verizon towers - I use the CDMA Sim)
Before this major update to 10 my phone worked flawlessly. Now it won't connect to the network much like you guys have stated in this thread. Mine will connect intermittently for like 3 or 4 min tops and then get kicked off the tower and will actually not show any bars (Circle with a line through it) to show no service for about 10 or so minutes then restart the whole process.
I also have a work phone (2nd phone) that is directly tied to the verizon towers on the verizon network. If I take the sim out of that phone and put it in my samsung a50 the samsung a50 is happy and can make phone calls, send texts, and stays on the vzw towers with no disconnects.
If I take my red pocket sim card and place it in my work phone that phone also works just fine - send messages, make phone calls, and stays on the vzw towers with no disconnects. (work phone = iphoneXR - it's free, sue me)
Even though reverting the modem obviously fixes your issue I do not think that is the actual problem. It also doesn't seem that a third party carrier is being randomly booted off the towers, it seems to be a glitch with third party carriers using third party sims utilizing this new android 10 software that VZW towers do not like.
Which obviously points to an issue with Samsung's latest software not being compatible with third party carriers.
I can't seem to contact Samsung in a direct manner to resolve this issue as they want me to take it to a third party store to have it looked at. I spent 2 and half hours with tech support from red pocket and they came to the conclusion that VZW was doing "upgrades/maintenance" to their towers in my area. (whatever that means.
Any ideas on how I can contact Samsung directly to detail this issue to them? I really do not want to have to root my phone in order to use odin to set my modem back to version 9 as I'm hearing that doing so voids all kinds of implied warranties with the phone and it's only 6 months old.
Appreciate any help that you guys might be able to steer me towards.
Thanks.

Before this major update to 10 my phone worked flawlessly- They Told you the answer, Odin # 9 or if its under warranty take it back Good luck.

My phone (SM-A505U) wasn't even working on visible before android 10.

See my post at the end of this thread: https://forum.xda-developers.com/ga...official-firmware-t3955727/page2#post83845605

I have that problem too. Where I can download v9. I got the Odin.

Question Android 12 no network fix

I am on Visible wireless and had no network connection. I was able to come up with a workaround.
I lost 5G though but I'd rather have SOMETHING working rather than nothing. Also thank goodness for a weekend with nothing to do and time to spare.
FIRST, see if your carrier has multiple APN SETTINGS. With Visible there a 4 total APN settings. For anyone with Visible go here:
https://www.reddit.com/r/Visible/comments/ehdeik
Second, pop out your SIM and throw in any different SIM. Thank goodness I had an old Cricket SIM laying around. I had it in there for about 5 minutes probably not necessary but that's what I did. Then popped in the Visible SIM and BOOM!!! I had it working! It's coming up as Verizon but who cares!? I can send and receive texts/calls now and data is working

Try clearing the SIM toolkit data...