1. A method for unlocking a mobile device comprising: receiving, at a server, voice information from the mobile device; analyzing the voice information at the server; determining if the analyzed voice information matches with a predetermined voice profile, wherein the voice profile is associated with multiple mobile devices; and if there is a match, sending, via a network, an unlock signal to the mobile device and sending, via the network, user information to the mobile device, the user information revealing information about the user associated with the matched voice profile; wherein the determining comprises: comparing the voice information with a plurality of predetermined voice profiles stored in a database; and determining if there is a match between the voice information and at least one of the plurality of predetermined voice profiles.