Not secured or protected by a lock. / (mobile telephony, of a phone) Not bound to any particular carrier.

simple past tense and past participle of unlock

plural of unlocker

One who, or that which, unlocks.

Not capable of being locked.

Capable of being unlocked.

(video games) An initially hidden feature that is made available to reward the player for some achievement.

plural of unlockable

plural of unlocking

The property of being unlockable (able to be unlocked).