A method, comprising: at an electronic device with a touch-sensitive display and a button, with both the display and the button on a first side of the device, and the button being the only button on the first side of the device: displaying a lock screen on the touch-sensitive display; receiving an input from a user, wherein the button has an embedded biometric sensor and the input from the user is received using the button with the embedded biometric sensor; detecting identification information of the user as the input is received using the biometric sensor; authenticating the user based on the identification information detected using the biometric sensor that is embedded into the button; and in response to authenticating the user based on the identification information detected with the biometric sensor that is embedded into the button, replacing display of the lock screen with display of an unlocked user interface on the touch-sensitive display, wherein the method further comprises: receiving a request from the user to access restricted resources of the electronic device; determining if the user is authorised to access the requested restricted resources; if the user is authorised to access the requested restricted resources, providing access to the requested restricted resources; if the user is not authorised to access the requested restricted resources, instructing the user to authenticate; after instructing the user to authenticate, receiving authentication information from the user and determining whether said authentication information matches that of an authorised user; and returning to said determining step above. displaying a lock screen on the touch-sensitive display; receiving an input from a user, wherein the button has an embedded biometric sensor and the input from the user is received using the button with the embedded biometric sensor; detecting identification information of the user as the input is received using the biometric sensor; authenticating the user based on the identification information detected using the biometric sensor that is embedded into the button; and in response to authenticating the user based on the identification information detected with the biometric sensor that is embedded into the button, replacing display of the lock screen with display of an unlocked user interface on the touch-sensitive display, wherein the method further comprises: receiving a request from the user to access restricted resources of the electronic device; determining if the user is authorised to access the requested restricted resources; if the user is authorised to access the requested restricted resources, providing access to the requested restricted resources; if the user is not authorised to access the requested restricted resources, instructing the user to authenticate; after instructing the user to authenticate, receiving authentication information from the user and determining whether said authentication information matches that of an authorised user; and returning to said determining step above. receiving a request from the user to access restricted resources of the electronic device; determining if the user is authorised to access the requested restricted resources; if the user is authorised to access the requested restricted resources, providing access to the requested restricted resources; if the user is not authorised to access the requested restricted resources, instructing the user to authenticate; after instructing the user to authenticate, receiving authentication information from the user and determining whether said authentication information matches that of an authorised user; and returning to said determining step above.