Methods and systems for transparently extending a multi-function device onto a mobile communications device. The mobile communications device and the multi-function device can be securely connected utilizing a random code displayed on a user interface of the MFD. An extensibility application associated with the MFD can be transparently combined with an execution environment of the mobile communications device to offer a number of services. A hardware and software resource of the MFD and the mobile communications device can be combined to perform composite operations involving data from both devices. The connection can expire after a period of inactivity and require physical proximity to be established to prevent unwanted access to the MFD. Such an approach establishes a shared extensibility framework for the multifunction device and the mobile communications device as a single execution environment.