I try opening the Sim Card Manager and it just stays grayed out. (Note 20 ultra)

[BandOfBrothers]

Has this always been the case or just started happening @Miqi  ?

Here are a few thread's with tips in.

Galaxy-s20-series/s20-fe-sim-manager-greyed-out. 

Galaxy-note20-series/dual-sim-always-on-greyed-out. 

Questions/dual-sim-options-greyed-out. 

If all else fails such as a factory reset after backing up then let a Samsung Service Centre take a look.

I wish you all the best.   

[Members_7gtmHLy]

Make sure you are not in flight mode.