S21 FE mobile data issue

[Xaskas]

Hello,

Since the May security update, my S21 FE has been unable to use mobile data from SIM1.

To clarify, i use both SIM card slots on my phone, and the mobile data works fine on SIM2

I have tried:

Restarting the phone

Turning airplane mode on and off

Changing the mobile data from SIM1 to SIM2 and back

There's no problem with the SIM or the network, since when i put it in my S9 the data works fine. 

Any suggestions?

[AndrewL]

@SharonN24: To begin with, please head to Settings > Connections > Mobile networks > Network mode, and makes sure that this is set to 4G/3G/2G (auto connect). This will ensure that your device is set up to connect to the strongest available data connection in your current location. Now, tap the Back button > SIM manager, and makes sure that your preferred SIM is assigned to mobile data. 

While you have the option of manually enabling Mobile data when you our outside the range of your nearest Wi-Fi router, you can also head to Settings > Connections > Wi-Fi > Tap the 3 dots in the top right > Intelligent Wi-Fi > Switch to mobile data, and toggle this option on. If it is greyed out, enabled Wi-Fi and mobile data, then toggle the switch to the right so it highlights.