I was driving in sone areas of Pennsylvania recently and my Tmobile cell had no service as well as sos of Safety System as well after pressing SOS button.

Anyone knows what carrier does it use? Att, tmobile or maybe Verizon?

 

I believe it is Verizon

 

I can’t recall where I read it, but I also recall seeing Verizon.

 

Does anyone know if there is a sim card from Verizon installed somewhere??

 

Highly doubt there is an actual card, most likely and e-sim.