No network connection on S23Ultra after November update

[ElectricChicken]

After installing a software update on the 18th of November on my Galaxy S23 Ultra, my phone has been unable to maintain connection to the mobile network. It disconnects every few minutes and displays 'Emergency Calls Only'. The only workaround is to either restart the phone or enable then disable airplane mode. However, this only resolves the issue temporarily. I have tried all troubleshooting steps I can find online but none have worked. I have spoken to my network operator, and they have informed me that this is a Samsung issue. They’ve had several other customers raising the same problem. I’ve also spoken to other Galaxy users who have had the same experience.

[Tourbillon De La Vie]

What have you tried so far 

[ElectricChicken]

Hi,

I've tried adjusting all settings as per troubleshooting instructions, including a full settings reset.

I've also tried the SIM in multiple slots.

I've also tried restarts after every troubleshooting step.

I've not done a full factory reset of the phone but would rather avoid that, particularly if this is a bug that won't be fixed by it. I've not found any other users with this issue who have resolved it with a full factory reset.

I'm wondering if rolling back the update would fix it but I don't know how to do that if it's possible.

[Tourbillon De La Vie]

Rollback is not possible. Is the phone  meant for the region you are in? As not a US or HNK etc originally device

[ElectricChicken]

It's definitely the right phone for my region. I'm in the UK and purchased directly from Samsung last year.

[Piper123]

What update did you install please?

S23 Ultra in the UK hasn't got the November Security Patch yet......

[ElectricChicken]

This is the info under last successful update which I installed Don 18th November.

Update information

• One Ul version: 6.1

• Android version: 14

• Version: S918BXXS6CX14 / S918BOXM6CX14 / S918BXXS6CX14

• Size: 2651.25 MB

• Security patch level: 1 October 2024

[Piper123]

Ok that's an operating system update.

Have you performed:..

Wipe Partition Cache
Reset Network Settings

Neither delete your data but for the network settings you'll need to input WiFi passwords again.

[ElectricChicken]

Just tried both of those but sadly no luck. Tried a full settings reset a few days ago too.

[Piper123]

Ok so, I don't think this will be your issue but....

Can you please check the IMEI number against one of the free data bases such as imeicheck just to make sure you device hasn't been blacklisted at all