Apple iPhone/iPad simlock status check service.
Sample result:
Model: iPhone 4s White 16GB [iPhone4,1]
IMEI Number: 01300XXXX52XXXX
Serial Number: DNTGPXXXXDTD2
Simlock: Locked
Model: iPhone 5S Space Gray 16GB [iPhone6,2]
IMEI Number: 3556710XX46XXXX
Serial Number: DX4RJXXXFFG8
Simlock: Unlocked