[Q] No Data network mode in metro/subway station - Galaxy S II Q&A, Help & Troubleshooting

Hi,
everytime when I have to go by sybway/metro, I loose my data network mode, it switches from 3G to GPRS or EDGE but doesn't work. Receiving phone calls works without problem, only the data network mode is not working/avaible while in metro/subway stations.
Anyone an idea?
Firmware is 2.3.5 KI3, location Germany.

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No Call when on WCDMA

All,
I just got a brand new Samsung S3 from Amazon.de yesterday.
I set the phone up and then turned data on. When I had GSM only mode, everything was perfectly fine. The moment I switched to WCDMA, on notification bar I see 'emergency calls only' and when I try to make a call it tells me that I am not registered on the netork - H+ is there and I can browse the Internet and have full coverage.
I rooted the phone originally, so to return to stock I flash XXBLG8 instead of the ALF5 that was on the phone.
Any ideas?
EDIT: I have also just noticed, that if I simply switch from WCDMA to GSM I get emergency call only too. Only after I got into flight mode and back I get normal coverage on 2G.
NOTE: Internet works on both 2G and 3G modes without problems.
Now I just used *#1234# to check CSC and it seems I am on BLG8 for PDA and CSC.
SIM card problem, of course.

[Q] Cannot make calls on LTE

hello guys,
I have a Galaxy S4 from Verizon NK1 I just moved to Mexico and switched to a local carrier (TELCEL) I am able to use data and make calls when I am on the GSM network mode, in this mode I only get 3G data, when i switch to LTE/CDMA I am able to use 4G data and it works great, however I cannot make or receive any calls, in fact if I try to make a call i loose data connection and I have to reset my phone to get data again.
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Network problems.

So today I got an p9000 elephone. Awesome phone buy I have problem with data. I'm in Germany and here eplus network is using aldi network, o2 and few similar providers. Sometimes I get R near strength bar. I am unable to use data then even tho I checked data roaming(this happens cause I am not in main network medion mobile but in o2 network ), then I need to use airplane mode and turn it back off so I can regain access to main network. Any advice's on this?
Thanks in advance.
Same problem here. But I live near the border to Austria, so I can't enable data roaming, because I don't want to pay Austrian network... I think national roaming doesn't work with the P9000...
But I tested turning on the roaming option for national roaming. That worked for me, even if there is no internet connection shown... But it's too risky for me to have Austrian network. So it's no solution for my problem.
exactly the same same problem here

SCH-I545 service mode messed up

Dear friends,
I did not find any similar problem resolved here (maybe I missed some, sorry in that case). Problem is as follows:
I have unlocked Verizon SCH-I545 model of Samsung S4 and I use it here in Serbia. Everything worked fine except 4gLTE. I only had 3G and H+ (max 6mbps download). Because of that I used to experiment with service mode (*#27663368378# this worked for me) and I messed something up. Now I have the situation that I can use phone only in GSM mode that I can set only through this service mode (GSM only) and then I have only Edge or GPRS for internet speed. When I switch to Global (which is used to work with 3g or H+ max) I lose network GSM and it keeps tilting (when it have edge it works but when it gets Gprs it says no service-emergency calls only). Than I am forced to switch to GSM mode again through meny to have my calls back. In prefered network mode I have only 1. Global, 2. LTE/CDMA, 3. LTE/GSM/UMTS. Is there any way to set this service mode settings back to default because I did the stock flash through odin with original samsung firmware (latest I545VRSGPL1) and did the factory reset before that with full wipe offcourse! I really love this phone and I am pretty desperate in my tries to resolve this issue. Please help if there is help!?
Best regards from Serbia

Constant disconnect and reconnects when using mobile data on 4G LTE network

I'm using a Samsung Galaxy S9+ for a couple of weeks now and noticed a strange issue.
Whenever I'm connected to my service providers 4G LTE network and use mobile data, I can see mobile data along with the mobile network get disconnected and reconnect quite frequently. As in, I can see the mobile signal indicator turn to no signal and then back on again.
It seems to occur when there is a burst of data communicating through the connection. i.e. start of a Youtube video playback, doing a speed test etc. It's quite frequent and annoying.
So far I've tried the following to no avail:
- Network reset
- Using a different SIM card
- Booting the phone in safe mode
Pretty sure it's not a network provider issue because my wife uses the exact same phone with exact same firmware and hers does not have this symptom.
Any help is appreciated.
P.S. - I have not seen the issue when connected to WiFi on the HSPA+ network of the provider. Seems to occur only on 4G LTE.
I tried the following additional scenario:
I put two sims;
SIM 1 for calls and text on 3G/2G auto connect
SIM2 for data on LTE/3G/2G auto connect mode.
SIM2 connects to 4G. Whenever there is a sudden burst of data on it, mobile networks on both SIMS disconnect and reconnect.

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