There is described a method of, and a circuit for supplying power to an integrated circuit card, ICC, of a wireless device comprising a first power supply unit. The circuit comprises a power pin connected configured to selectively operate as a power input pin or as a power output pin, and adapted to be connected to the first power path of the device through a second power path of the device; a second power supply unit; and a controller configured to cause the power pin to operate as a power input pin in the first operation mode of the device, or as a power output pin in the second operation mode of the device. A wireless device comprising the circuit and a method of supplying power to an ICC are further disclosed.