"To unlock the handset" means to remove the restrictions on a mobile phone or similar device, allowing it to be used with any carrier or service provider. Full definition
The rear - mounted fingerprint sensor can either be used for unlocking the handset as well or accessing a secure portion of the phone. (androidheadlines.com)
The rollout will likely begin with unlocked handsets in Asian countries, followed by European markets. (ibtimes.com)
A new report claims the smartphone will include an iris scanner that will allow users to unlock the handset with their eyes. (techtimes.com)