I recently purchased a Curve 3G-9300 up in Canada, under Bell. I received unlock codes and all, and unlocked my phone to use my AT&T SIM card. It was working fine until it suddenly stopped registering the SIM card, right around the time I added a data plan to my phone. I've tried MEPD and MEP4 and there's no codes needed to be put in, as everything is disabled. Has anyone had this issue and/or knows a solution? It would be greatly appreciated.
