My iPad 2 3G used with an unlimited AT&T data plan and works fine. After I did a restore to iOS 3.22, the iPad lost the settings for cellular 3G service completely and couldn't recognize the SIM card. It just turns into a wi-fi only iPad.
To fix it, tap Settings > General > Reset Network Settings. And use the SIM eject tool to open the SIM tray in the iPad 2, remove the SIM card and insert it again.
Wednesday, July 6, 2011
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