I recently unlocked my Samsung Galaxy S 3. I moved from T-Mobile to AT&T. Now, whenever I connect to wi-fi to make calls I get this error- Error- ER05 "invalid SIM" I have no idea what to do. I would go to the store, but I've had hell with them just trying to figure out how to make my unlocked phone work properly (I figured most of that out on my own). Please HELP!!