A mobile communication device with positioning capability is provided, including: a global navigation satellite system (GNSS) receiver; a communication circuit for generating a control signal; an oscillator shared between the communication circuit and the GNSS receiver, for providing a clock signal having a frequency value corresponding to the control signal; and a decision unit, coupled to the communication circuit and the GNSS receiver, for recording the control signal; wherein the GNSS receiver obtains the frequency value of the clock signal according to the control signal recorded in the decision unit.