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. <EOS>