Network problem after android 15 update

[Tkhalif]

Since i have updated my s23 ultra to Android 15 update, i have a connection problems. 

I have tried all solutions by the way.

[SamsungModerator4]

Hello. I’m Aya, Samsung Moderator
Thank you for asking the question
We wish you a happy day
Based on your inquiry regarding 

kindly follow the below steps
Regarding network issues, please follow these steps: Settings - More - More Networks - Mobile Networks - Network Mode - You can choose a network other than the one you're using.
You can try Airplane Mode and then turn it back on to activate the network.
You can test the network by dialing *#0011#.
If the other SIM card is working, the problem is with the first SIM card. Please contact the network developer for that SIM card.If you are still facing the same issue we recommend that you perform a factory data reset to resolve this issue using the steps below:-
Launch the Settings app and tap General management → Reset → Factory data reset →
RESET → DELETE ALL.
Ensure all user data is backed up using smart switch
from the link below and then use the backup tool to create a data backup
http://www.samsung.com/eg/support/smartswitch/
If you’re still facing the same issue, kindly take the device to the service center to check on it.
Your permission to activate maintenance mode before entering the device to the maintenance center
To protect your personal data
The function of maintenance mode is to protect your privacy while someone else is using your phone, such as when you send it for repair.
This feature prevents access to personal data on the device. In maintenance mode, your personal data, including photos, messages, and accounts, cannot be accessed, and only pre-installed applications are available.
Activate maintenance mode as follows:
First, you will need to unlock your phone to turn off maintenance mode.
Second, go to Settings > Device care > Maintenance mode > Activate
If the issue wasn’t resolved you can honor us with your visit to the nearest service location in order to diagnose the device and solve the issue.
If the device enters the maintenance center, a factory reset should not be performed to enable a better examination and solution to the problem.
You can send us your city and residential area to send you the nearest service center or you can follow the link below to find the nearest one :
http://www.samsung.com/eg/support/servicelocation/
If you have any other question, can you explain it to us
We are  at your service always
Thanks for your time