I got the new iPhone 12 Pro bought directly from Apple. I just swapped my SIM card but my phone doesn’t seem to be finding any 5G signal after driving around Luxembourg (Belair, Kirchberg, Foetz, Howald). 
 

what is coverage like? Is there a coverage map?

Do I need to do anything to activate 5G since I didn’t buy the iPhone from Tango?

im on Smart XXL plan which says it should get 5G Max speed.