What does it mean for my device to be 'locked?' Or 'unlocked? Iphone 4 Digit Passcode Unlock. ' • The term 'locked' typically refers to a device that can only be used on the Sprint network and cannot be activated on a competing carrier's network. An 'unlocked' device is no longer locked to Sprint's network and the user may attempt to activate it on another carrier's network. At&t Phone Unlock Website more. There are generally two scenarios for device unlocking: • Domestic SIM Unlocking ('DSU'): A device may be referred to as 'locked' if that device was manufactured with programming restrictions that prevent another carrier's SIM card from being inserted into the SIM slot for use on a different network.

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