I recently let my StraightTalk (ST) expire and switched to ConsumerCellular (CC) keeping the same phone number. CC asked that I keep my ST SIM in until the phone quits than put in the CC SIM. Well it has been over a week since my ST account expired, I confirmed on the ST site my SIM is deactivated, however, everything is still working. I have not tried my CC SIM yet. Both CC and ST are re-sellers of AT&T; is it possible I am getting my CC service through ST SIM? How can you tell who is your provider?