A dual-mode phone wirelessly communicated with a network device is provided. The dual-mode phone comprises a detecting module, a radio frequency (RF) module, and a processing module. The detecting module is for detecting a setting of the dual-mode phone. The RF module is for establishing connection between the dual-mode phone and the network device. The processing module is for switching on or off the RF module, and for controlling the dual-mode phone to enter or exit a power management mode or a communication mode. A power management method for a dual-mode phone is also provided.