Do you happen to be in possession of the Samsung Galaxy S2 LTE smartphone. If you have answered in the affirmative, then you would be pleased to hear that you can perform an update for the device, and this can be done Over The Air (OTA) or via KIES, depending on which is your cup of tea. This is no pre-release ROM leak, or a custom ROM, but rather, it is the official Android 4.0.3 update that when applied, will enable you to take advantage of features including Facelock without running into any issues.
Ubergizmo, Samsung Galaxy S2 LTE gets Android 4.0.3 update