Just got this device from a friend whose Wife too it for a swim 😲 She got a new fon but what I can't figure is it says "Invailid or missing SIM" which it is missing the SIM. It powers up just fine. I put my (Cing) SIM into it (Device Also Cing) but same MSG. Any Help. PS I work for AT&T (Cing) but cant call till i get her last 4 of SSN