My phone seems to be locked, with the itunes logo and image of a usb cord with an arrow pointing toward the icon. The only thing it will do is slide open to make an emergency call. There is a little lock symbol at the top. I connected to my mac to upload photos, and it wanted to upgrade softwear, so I clicked ok. Now in my Itunes screen, it says that the sim card is not supported and that i need a compatible sim card. I have been using this phone for a year with no problems. Did Apple find a way to lock any phones that are synced thru Itunes, that are not using AT&T? What do I do to get it get it working? Thanks