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If it is a CDMA iPhone (iPhone 4s and later), it will mention support for CDMA and GSM networks.Instant iPhone Check if Locked or Unlocked for iPhone 7, 6S, 6, (plus), SE, 5S, 5C, 5, 4S, 4, 3GS and 3G. iPad.
Early GSM iPhone 4S adopters may be happy to hear that Twitter user xoicos has found a way to unlock the new handset using a bug in iOS 5.