Unable to get Mobile data access after One UI 6.1 update

[rocketman18]

Hi All,

Is anyone experiencing mobile network issue after upgrading to One UI 6.1?

Since I upgraded despite mobile data turned on and It displayed on the taskbar icon 4G+ OR 5G, I still unable to get on the Internet. 

I have run Device Care diagnostic and network and sim card checked ok/no error found. I have reset mobile network still nothing. 

I have taken the device into the mobile network company for further investigation. All checks performed again, a new sim card was used in SIM 1 tray failed to get on the Internet. 

The new SIM card placed in another phone and EVERYTHING worked. The SIM was placed back into my S23 ULTRA and still no access to the Internet. 

SIM 2 tray used with the new sim card and got access to the Internet. 

Can I revert to One UI 5.1 after upgrading on 28 Mar?

I have further updated my phone to 1 Apr security but the problem still there?

Is anyone experienced the same?

Awaiting your help/support. 

Regards

Rockman18

[Tourbillon De La Vie]

So, sim1 is playing up. I'm assuming no esim Contact Samsung tech support 

[Piper123]

Hi there

A small number of users have reported a similar issue.

You mention you've changed sim, tried sim elsewhere, reset mobile network settings etc

Have you checked that your network APN and password are correct? (When you reset network settings these should have reset via a network update but doesn't always work).

Sadly it is (almost) impossible to go back in your OS and even if you tried it comes with massive risk and a loss of warranty.

[rocketman18]

Thank you. I will contact the Samsung Technical support team.

[rocketman18]

Thanks Piper123.

[Caspurr]

I have experienced the same problem - both physical SIM cards are not recognized.  There is nothing wrong with both cards.  I ended having to factory reset my phone.  This happened to me 3 times, the last was after I switched on Aeroplane Mode and after I switched off, both SIMs were not detectable by the phone.  I was unable to find any other solutions in the internet on this.

[rocketman18]

Thanks, Caspurr. I have reset the phone too but it still didn't work so I contacted Samsung and I sent it for repair but everything PASSED after I got the phone back the same day inserted the SIM card still unable to access any websites despite 4G+ and 5G shown on the phone so returned it again and ask them to troubleshoot the issue .

[Caspurr]

Unfortunately, my phone did not get fixed.  I had to back up the data, factory rest the phone, restore the data 3 times.  Not sure how long the latest reset will last.    At least your phone shows 4G and 5G connection.  Mine showed "No SIM cards detected",  no IMEI information on either SIM slot or my phone number.  Weird.  Worse case scenario would be to get a new phone...

[Ekrima]

I faced same issue after this shat

[Members_fXiJPJs]

Has anyone found a solution to this problem? It appears that the only solution MAY be to replace the motherboard. I'm reluctant, and if I do it will be with a 3rd party. Samsung is not going to get anymore of my money to fix the problem they caused.