Inserting a foreign SIM card kills the internet over wi-fi - please help! - Android Q&A, Help & Troubleshooting

Dear Experts,
I'd like to give my old Samsung Galaxy S2 to somebody as a present.
He is living in another country. We inserted his SIM card and suddenly
and to our biggest surprise - internet over wi-fi just stopped working !!!
The phone still sees all the network, it's possible to connect, but neither
the browser, nor any app gets data from the internet.
I've tried rebooting the phone, disabling and enabling mobile data and
also changing the CSC code according to this guide:
http://www.droidviews.com/how-to-change-csc-in-samsung-galaxy-phones/
but it didn't work - I didn't see the list of CSC codes. As soon as we
removed the SIM card, internet works again immediately.
This is very very weird - what does the connection over wi-fi has
to do with the SIM card ?????

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[Q] My Atrix 4G does't connect to mobile internet

Hello,
I have an unlocked AT&T motorola atrix 4g mobilephone in Spain. If I put inside it a Vodafone SIM card I can connect to the internet (3G) without any problem after setting the APNs, but when I try it with a Euskaltel SIM card (an Spanish virtual mobile network provider that uses the Vodafones network) I can't connect to the internet (3G) even if I set the correct APNs.
The problem is not the SIM card because it works in a Nexus S after setting the APNs, and as I have said, the Atrix also connects to the internet with a Vodafone SIM card. But Euskaltel+Atrix doesn't work.
The wierd thing is that after I set the APNs, or activate the internet roaming, sometimes appears the arrows that it is connected but just for a few seconds and then dissapear, but even with the arrows if I open quickly the web browser it claims that doesn't have internet connection.
I have tried with other ROMs and the same thing happens, and also with an AOSP ROM like CM7 beta, there is no way to make it work.
Does any one have any kind of clue to solve this?
Regards and thank you
gonzalobf said:
Hello,
I have an unlocked AT&T motorola atrix 4g mobilephone in Spain. If I put inside it a Vodafone SIM card I can connect to the internet (3G) without any problem after setting the APNs, but when I try it with a Euskaltel SIM card (an Spanish virtual mobile network provider that uses the Vodafones network) I can't connect to the internet (3G) even if I set the correct APNs.
The problem is not the SIM card because it works in a Nexus S after setting the APNs, and as I have said, the Atrix also connects to the internet with a Vodafone SIM card. But Euskaltel+Atrix doesn't work.
The wierd thing is that after I set the APNs, or activate the internet roaming, sometimes appears the arrows that it is connected but just for a few seconds and then dissapear, but even with the arrows if I open quickly the web browser it claims that doesn't have internet connection.
I have tried with other ROMs and the same thing happens, and also with an AOSP ROM like CM7 beta, there is no way to make it work.
Does any one have any kind of clue to solve this?
Regards and thank you
Click to expand...
Click to collapse
Try creating a new apn & call the first field "euskaltel" & the second one "internet", leave the rest as they are, click save & activate it. That worked for me a couple of months ago with a yoigo card.
It doesn't work, but thank you anyway

How to connect via 3G network

Hello every one. I've got some problems here.
I bought a Sony Tablet S(SGPT113HK/S). You know, it has a 3G module. I have update it to 4.0.3 releas1a via WIFI. But when I insert my sim card then turn the power on. It do have network service for maxium 30sec. After that there is no mobile network service anymore. Of cource the sim card is for WCDMA/EDGE. I suspect there is service lock, but the tab didn't ask for pin to unlock. And during the 30sec I have mobile network I really can open a website.
Does anyone can help me.
PS.baseband is R3B01.

(Mobile) Internet is not working

Good day y'all,
I have a problem with the mobile connection on my phone, which is a Samsung Galaxy S4 (i9505) with CM10.1.
The mobile connection only works for a couple of minutes when i reboot the phone. After that time, it says "Offline" or "No network connection". I can still do phone calls though, so the connection to the celltower is still established.
APN settings are correct.
Data enabled is ticked
Data roaming is ticked (I need this, because my provider is using the mobile network of another provider)
Turning aeroplane mode on/off will not solve it.
Re-enabling data/-roaming will not solve it.
Switching to 2G mode will not solve it.
Searching for network again will not solve again.
Only reboot solves it.
Any idea what is going here? It's quite annoying.
Thanks.
Just reflash your rom.
Doesnot help. I am flashing the ROM almost daily plus i erase all caches.
*bump*
Now i tried the following:
Using the SIM card of my wife (different provider) -> no problem
My SIM card in my wife's phone -> no problem
My SIM card in my phone -> only working for two minutes.
I tried to modify the spn-conf.xml file by adding
<spnOverride numeric=”23212? fake_home_on=”23201?/>
so that the network is not seen as roaming network.
Still not working.
Now i changed the MCC/MNC to 23201.
Also not working.
Any idea what else i can modify?

[HELP] No Network Suddenly

Hey guys
my SGS3 GTi9300 suddenly does not detect any mobile network. I cannot make or recieve any calls :crying::crying:
I have tried using a different sim card and same issue. No Service.
My sim card in a different phone works properly.
Manual searching of the network does not work.
reboot, airplane etc does not work.
My IMEI and everything is proper I havent made any changes in the phone. A very Spontaneous problem.
everything else works fine. wifi bluetooth etc.
I am from India on LiquidSmooth v3.2 rom. Android 4.4.4.
Network provider Reliance.
Please help
Try a different modem.
The one you WAS using will work but do you know what one it was or have a back up of it? I'm from the UK so I don't know what modem you would use. Also check apns as this happens with that to. All this fails go back to stock and test. If that is still a fail it time to check if imei is blocked by provider . I belive India networks now block imei that have been reported.
Solution
Surprisingly changing the network mode from 3g to 2g worked. Now I have network.
My service provider sent me the settings again maybe they got deleted or something.

SAMSUNG PIE: SIM card detected and enabled but cannnot find/connect to mobie network

Hi,
I purchased a USED Galaxy A7 2018 dual sim F variant. When I first inserted my SIM card, it was working fine. 4G and calls, all were working.
But after I factory resat it, mobile network stopped working or even detecting. SIM card is still detected and I can see it in "connections" under SIM cards in settings app on my phone. But when I try to dial a number it says "not registered on network". On lock screen, it says emergency calls only. When I go to "mobile networks" in settings app and tap to select network automatically or manually, it gives error that unable to find/connect to a network.
I tried three different sim cards yet same thing happens. SIM cards work just fine in other phones. Also, it is not a problem with sim tray on phone as sim card is detected and shown and as I said before, mobile network was working fine before resetting the phone.
When I purchased it, there was a custom ROM installed on it and OEM Unlocking was ON. I installed latest stock ROM from Samsung plus a couple of stock ROMS but same thing happens with every ROM.
I am out of ideas on what should I do now. I would really appreciate any help anyone can give.
Thanks.
Finally found a solution.
https://forum.xda-developers.com/android/general/guide-restore-imei-fix-corrupted-efs-t3116217
This fixed my issue.

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