SIM card error 10/14/2011 640 × 960 Launch-day Sprint iPhone 4S in NOT Unlocked Your AT&T SIM card is not welcome here. Share this:Click to email this to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)