Transfer Sim from one car to another?
 

I have 2014 A6 and my dad just got a CPO 2014 s4. I know i know it should be the other way around but he is going thru after retirement lost purpose in life crisis and this is his way of resolving his problems.

Anyhow his car came with the working sim and he says he doesn't need it. So i took the sim and put it in my car. I see the signal being picked up but data is not working.

Is there a setting that I need to change? It's a white full size sim.

Any info is greatly appreciated.