SIM card missing or invalid in Lumia 1020
A few times I encountered the problem ..SIM missing or invalid card ..
I found a way to stick tape on the sim tray but worked only 1 data..a second time did the same but with all the duct tape ..
What would solve the problem? I understand that the problem would be the operating system ..
Sorry for bad english..translate with google translate....
....hugs & cheers...