A mobile device capable of running at least two operating systems (OS), and a method for sharing a wireless communication module between the operating systems are provided. A hardware controller is configured to communicate between the two operating systems. First, a first operating system encodes an instruction into a first uniform message and transmits the first uniform message to a second operating system, in which the wireless communication module is installed, through the hardware controller. Afterwards, the second operating system enables the wireless communication module to start receiving positioning data according to the first uniform message, encodes the data into a second uniform message, and sends the second uniform message back to the first operating system through the hardware controller. Finally, the first operating system decodes the second uniform message into positioning data.