I Face Network Registration Failure After Android 15 Update on Samsung Galaxy A54

I purchased a Samsung Galaxy A54 and installed the Android 15 update in September. Since then, my device has developed a critical problem: I constantly receive the error message “Not registered on network”, which makes it impossible to make or receive phone calls. Others also cannot reach me.

I attempted several troubleshooting steps:

Factory reset

Testing with different SIM cards

Confirming with my operator that there is no issue on their side

Restarting the phone and toggling Airplane Mode (works only temporarily for a few minutes)

None of these resolved the issue. The phone quickly becomes unusable again.

I contacted Samsung customer service, and they instructed me to reset the network settings. Unfortunately, this also did not fix the problem. My device’s warranty expired about two months ago, but given that the fault appeared directly after a software update, I believe this is clearly a software-related defect.

Device Serial Number: R5CW31QL8QJ
Location: Antalya, Manavgat

I am requesting that Samsung:

Provide a free repair despite the warranty expiration, since the defect is tied to the update, or

Offer a permanent fix via software patch to restore full network functionality.

This is an urgent matter, as my phone is currently unusable for its most basic function. I expect Samsung to resolve this issue quickly and uphold customer satisfaction.