No its not a problem with the carrier. Like I said it WAS working(The ONLY thing not working was the Bluetooth) then all off sudden it(tthe SIM) stopped working and then when I put the sim card back into its original phone it was again not working there when it was working fine beforehand. Something in that flimsy sim tray or inside the slot might have scratched it up. I have no idea but what I know is that the SIM card worked and then it did not. On top of that it also does not read my SD card that I added so I’m not confident at the point in time that this particular device and its assembly. I honestly don’t want to put another SIM in this phone but I will once the new one arrives. And if that one breaks… well… Thanks though. I’m trying here. Just not a good start but a good finish will fix that. We’ll see.