S21 ultra Signal loss problem after uploading to one ui 7

[Ahmadi]

After updating my S21 Ultra to one ui 7 android 15 , I have a problem with the network connection.

The network is completely disconnecting and goes into emergency mode, or it loses the antenna altogether, and I need to restart my phone every time to be able to connect to the network again. 

[mytolis8080]

Similar situation with my S24 Ultra. Been having issues since I updated to one UI 7. 😕

[userzo20ozx2yb]

Try E-sim or try to change your old sim card with new one, it should work

[Ahmadi]

It was the same problem with every SIM card I tried. 

[Mujibar]

Reset mobile network settings. Settings, general management, reset.

Also clear device cache:

1) Turn off your device.

2) Press and hold the Volume Up button and the Side/Power button until you feel a vibration and the Samsung logo appears. Let go of the buttons.

3) You will now be in Android recovery. Use the Volume buttons to highlight "Wipe cache partition."

4) Press the Side/Power button to execute.

5) Use the Volume buttons to highlight "Yes."

6) Press the Side/Power button to execute.

7) "Reboot system now" will already be highlighted. Press the Side/Power button to execute.

[Ahmadi]

I tried this method, even hard reset the phone, but the problem still didn't resolve. 

[shilo88]

Im having the same problem. The network goes from "emergency calls only" to "not connected". It'll briefly connect to att then emergency calls only. I've done the mobile connection reset, clear cache, and soft reset.

[userFsk0nA9ZJb]

I'm having the same problem of emergency or no service with s22 ultra after update using e-sim even after troubleshooting