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[Q] Can't connect to mobile network

Hello,
I've got a Galaxy Note, which a mate gave to me, because he has the new Note 2 now.
He said that he has some network problems (he has two times vodafone.cz), but didn't say anything in detail. So I thought the problem would be solved with flashing another rom, like CM 9.1. He already had the stock 4.0.4 and I read that I have to flash back to GB before flashing to CM 9.1.
At first I made a backup of the efs folder with kTool. After that I flashed the LC1 version of GB (3 parts, open Europe) but with this flashing process, I lost my IMEI ! So I wanted to restore the efs folder with kTool again, but it didn't work for me, I still had no IMEI.
I thought that the structure of the efs folder could have changed from 3.6 to 4.0.4 and that this would be the reason why I can't restore the efs folder. Therefore I flashed back to a Samsung stock rom of Android 4.0.4 (N7000XXLRG_N7000DBTLRG_DBT).
And then the surprise: I had my IMEI back, without restoring the efs folder!
This just was the background. Now to my problem: I still can't connect to the mobile network. In the notification bar is written "emergency calls only" (I don't know if it is translated on the right way, because I'm from germany). If I go to the network settings and search for mobile networks, I find all the networks I reach in my area, o2-de as well, which is my favourite network. But if I want to register to the network, it takes a while and then it says: Registration failed. And after that, I also can't make emergency calls, there is written "No service"
All in all my question is: Why am I able to find networks, but can't register to my one? I also tested it with other SIM-cards from other providers, but it still does not work..
I hope anyone of you has a solution for my issue.
greetings
Senfy
Edit: My IMEI begins with 359, so it should not be a developer IMEI

May be it has network lock. Have you tried apps like galaxy s unlock from the play store.

I tested it now, but everytime I want to unlock my phone, I loose my IMEI and I have to restore the efs folder..
But if I open Galaxsim Unlock, it says my device isn't locked.. so this seems to be not the solution..

Now I flashed to CM 9.1 with the hope to solve this problem.. CM 9.1 works, but I still can not register to my network... has anyone another idea how to solve this problem ??

Are you check an eyes in code or test menu ?
Go in dialer and tape
*#0011#
Then use menu and back in menu to come on general and check in different menu(debug)

I'm sorry I don't understand you. If I dial this code nothing happens. I also searched for this code (google) but without any result.
maybe you could post a link with an exact description how to do what you mean..
But thanks for your effort.

Now I wanted to flash another modem.. but everytime I want to flash it, I lose my IMEI !
The only way to get my IMEI back is to flash back to N7000XXLRG_N7000DBTLRG_DBT ...
I don't know what to do next.. I would be glad if someone could help me..
Edit: What I forgot to tell you: The reception of emergency calls goes up and down over the time.. maybe someone of you can conclude anything out of this information..

Doesn't anyone have an idea how to solve this problem?

how are you flashing the modem? tried mobile odin?

I flashed the whole GB (3 parts) with PC Odin and the actuall modem with mobile Odin but with no success..

Where is da solution 2 no network after update
Sent from my GT-N7100 using xda app-developers app

Houston! I have a problem!!!

I have this N920C 64GB version from Dubai.
I am in Turkey so I have to use a Turkish Sim Card.
The phone had Marshmallow on it when I came to Turkey.
I updated it to Nougat. The sim card didn't work. I had a Marshmallow TWRP backup. I only restored the EFS & Modem. So it carried on working until yesterday when I tried to download the latest firmware from Sammobile. I did exactly what I did before. I flash the firmware, then "not registered on the network" pops up. I restore the EFS & modem, then "IMEI and Baseband" turns "unknown". Restoring the whole backup didn't work either. (It used to work before..)
I tried to downgrade to Marshmallow, it fails every time, (OEM unlocking and USB debugging is on.)
I tried everything what I already know and everything I read on the internet, since yesterday. Now I am downloading the multi-file firmware fix for Marshmallow to see if it works, because multi-file fix firmware for Lollipop 5.11 failed in Odin.
I tried few modems but none of them worked. I hope you can help me...
Thank You very much for reading...
EDIT: I have downgraded from Nougat to Marshmallow successfully by flashing a custom rom.
IMEI & Baseband shows normal but still cannot make or receive calls. I can see the signal bars strength but "Not registered on network" error continues.
Flashing modems still doesn't work. Flashing official 6.0 fails too...
Is there anyone who can help?
Thank You...
LAST EDIT: First, I did a TWRP backup, all partitions including efs & modem.
I opened the root explorer app, opened the efs folder, deleted the files named nv_data.bin
, nv_data.bin.md5 & the folder called imei. Then opened twrp, wiped all partitions. Flashed the latest firmware with Odin.
Finally, it is done...
Now, I am deleting every backup I created before...
Thank You...

falconsson said:
I have this N920C 64GB version from Dubai.
I am in Turkey so I have to use a Turkish Sim Card.
The phone had Marshmallow on it when I came to Turkey.
I updated it to Nougat. The sim card didn't work. I had a Marshmallow TWRP backup. I only restored the EFS & Modem. So it carried on working until yesterday when I tried to download the latest firmware from Sammobile. I did exactly what I did before. I flash the firmware, then "not registered on the network" pops up. I restore the EFS & modem, then "IMEI and Baseband" turns "unknown". Restoring the whole backup didn't work either. (It used to work before..)
I tried to downgrade to Marshmallow, it fails every time, (OEM unlocking and USB debugging is on.)
I tried everything what I already know and everything I read on the internet, since yesterday. Now I am downloading the multi-file firmware fix for Marshmallow to see if it works, because multi-file fix firmware for Lollipop 5.11 failed in Odin.
I tried few modems but none of them worked. I hope you can help me...
Thank You very much for reading...
Click to expand...
Click to collapse
Well, once you go to nougat, you can't really downgrade.

falconsson said:
I have this N920C 64GB version from Dubai.
I am in Turkey so I have to use a Turkish Sim Card.
The phone had Marshmallow on it when I came to Turkey.
I updated it to Nougat. The sim card didn't work. I had a Marshmallow TWRP backup. I only restored the EFS & Modem. So it carried on working until yesterday when I tried to download the latest firmware from Sammobile. I did exactly what I did before. I flash the firmware, then "not registered on the network" pops up. I restore the EFS & modem, then "IMEI and Baseband" turns "unknown". Restoring the whole backup didn't work either. (It used to work before..)
I tried to downgrade to Marshmallow, it fails every time, (OEM unlocking and USB debugging is on.)
I tried everything what I already know and everything I read on the internet, since yesterday. Now I am downloading the multi-file firmware fix for Marshmallow to see if it works, because multi-file fix firmware for Lollipop 5.11 failed in Odin.
I tried few modems but none of them worked. I hope you can help me...
Thank You very much for reading...
EDIT: I have downgraded from Nougat to Marshmallow successfully by flashing a custom rom.
IMEI & Baseband shows normal but still cannot make or receive calls. I can see the signal bars strength but "Not registered on network" error continues.
Flashing modems still doesn't work. Flashing official 6.0 fails too...
Is there anyone who can help?
Thank You...
Click to expand...
Click to collapse
Download and flash nougat firmware for your region and check. Or the next remaining thing to do is use samsung kies to recover device to original.

G610M - AOPS ROMs - No SIM Card / Service

After flashing 610M (csc: TPA) the phone shows "No sim - No service", even tough in sim card management it's there but no carrier is shown.
I tired:
1. IMEIs were there, but I still tried to restore EFS
2. Tried both sim card slots (the second one can at least receive messages, rather weird thing)
3. I tried to flash CP and CSC trough Odin after installation
4. CSC Changers do not work: errors
5. Tried to install similar ROMS: ResurectionRemix, AospExtended and crDroid... same problem over and over
6. Tried flashing latest Oxygen kernel v.5 - no luck
7. Tried installing without GAPPS - no change
8. Tried flashing latest modem from 8.1 official - nothing
Please, help me good people, I'm out of ideas. Currently using Millennium ROM, everything works. No possibility to buy a new phone, but I miss the simplicity and snappiness of AOSP roms. Thank you.
EDIT1:
I found out that even after flashing CSC in Odin. PhoneInfo app shows that there's not CSC or CSC firmware at all. Attached screenshot.

Have you tried checking if your IMEI numbers are blocked in your country?. Could be blacklisted by an operator.

From which state you are probably problem in restricting the device

TheFixerMED said:
Have you tried checking if your IMEI numbers are blocked in your country?. Could be blacklisted by an operator.
Click to expand...
Click to collapse
I use Millennium ROM (which is non-AOSP) right now, and cell service works perfectly. I can try checking of course (will reply later).

eXrump said:
I use Millennium ROM (which is non-AOSP) right now, and cell service works perfectly. I can try checking of course (will reply later).
Click to expand...
Click to collapse
Weird, I have the same model as you and I've flashed a few AOSP roms (Havoc OS, DotOS) and no problems with my signal.
Well, if it works in TW, then it could be the radio firmware in the AOSP roms that is causing the problem with your signal. Im not sure how you can flash the radio firmware once you are in an AOSP rom, but you could try making a backup of the radio related partitions with the Millenium ROM installed and then try to flash the backups once you flash an AOSP rom.
Make a full backup just in case something goes wrong.

TheFixerMED said:
Weird, I have the same model as you and I've flashed a few AOSP roms (Havoc OS, DotOS) and no problems with my signal.
Well, if it works in TW, then it could be the radio firmware in the AOSP roms that is causing the problem with your signal. Im not sure how you can flash the radio firmware once you are in an AOSP rom, but you could try making a backup of the radio related partitions with the Millenium ROM installed and then try to flash the backups once you flash an AOSP rom.
Make a full backup just in case something goes wrong.
Click to expand...
Click to collapse
Thanks for the reply. I did try to restore EFS and Modem partitions after flashing DotOS, but no luck. I looked at the *#*#4636#*#* menu; and there's a signal (decibels change). It's like it doesn't read SIM cards (I've tried another one with different carrier).

LineageOS 17.1 N950F/N No Cellular Network "Emergency Calls Only"

Hello everyone!
I am new to custom ROM flashing. I got a Samsung Note 8 N950N (korean model - I guess) - but it shows N950F in Settings app. I got a used phone from someone, and they had installed some custom ROM on it.
Now, I flashed LineageOS 17.1 on it, everything is working smoothly so far but my mobile network isn't working. I can't make or receive calls. The phone is showing "Emergency Calls Only" - but showing the network name, and I can also access the SIM card toolkit inside the phone.
I tried clearing cache and everything but can't seem to make it work. I tried using the manual cellular search, but it says couldn't find any network.
It is a dual sim phone, I had 2 IMEI appearing on earlier ROM, but now with LineageOS 17.1 - I am only getting 1 IMEI as well.

Update: I restored to the OLD ROM (LamLazy Rom v3 Dual SIM) - and the network is now working back on the phone. I don't know why it wasn't working on LineageOS 17.1, can someone please help?

Did you manage to get a custom working with cell service too?

Emergency Calls Only on Custom ROM N950F/N/FD - URGENT HELP

I am new to Android Custom ROM and everything. I got this phone from a local vendor and it was running a custom rom called "LamLazy Rom v3.0 Dual SIM" - I researched on it and figured it was used to convert N950N to N950F or something like that.
I have the EFS and TWRP complete backup of the LamLazy ROM. I wanted to try LineageOS 17.1 on my device and flashed it using TWRP. After the successful flashing, I noticed my phone can no longer connect with my network. I cannot make or receive phone calls. I tried every possible thing that I knew. Even flashed series of Custom ROMs, on every other rom I faced the same network issue.
However, when I revert back to LamLazy it works fine. I can use both of my SIM slots and my phone shows 2 IMEI's while on lineage and other it shows only one IMEI.
Now, my problem is I want to get rid of LamLazy and try new ROMs such as Pixel Experience and LineageOS, but my cellular network doesn't work. Can someone please help me with this? :crying:

HamzaSheikh said:
I am new to Android Custom ROM and everything. I got this phone from a local vendor and it was running a custom rom called "LamLazy Rom v3.0 Dual SIM" - I researched on it and figured it was used to convert N950N to N950F or something like that.
I have the EFS and TWRP complete backup of the LamLazy ROM. I wanted to try LineageOS 17.1 on my device and flashed it using TWRP. After the successful flashing, I noticed my phone can no longer connect with my network. I cannot make or receive phone calls. I tried every possible thing that I knew. Even flashed series of Custom ROMs, on every other rom I faced the same network issue.
However, when I revert back to LamLazy it works fine. I can use both of my SIM slots and my phone shows 2 IMEI's while on lineage and other it shows only one IMEI.
Now, my problem is I want to get rid of LamLazy and try new ROMs such as Pixel Experience and LineageOS, but my cellular network doesn't work. Can someone please help me with this? :crying:
Click to expand...
Click to collapse
i bought a note 8 from someone and it was running a custom os tried to iroall stock rom and i now i get emergency calls and cant register on any networks..my phone is only a single simcard phone but it shows two imei numbers now and one is 0000000 pleass help i dont even know how to post on xda sorry for hijacking your post