A mobile device provided with a secure chip and a short-range wireless RF communication module, which can be used for contactless transactions with external short-range wireless RF communication devices, for example at a point of sales. The mobile device is provided with user selectable activity levels of the secure chip to reduce security risks/concerns associated with such a terminal. The user selectable activity levels may include levels in which the secure chip is deactivated by default, and only temporarily activated upon user confirmation or the entry of a password or PIN.