A method for adjusting frequency channels in a Bluetooth device is provided. The method includes the following steps: providing Bluetooth circuitry and wireless-technology circuitry of the Bluetooth device, wherein the wireless-technology circuitry implements wireless technology other than Bluetooth; and responsive to a band used by the wireless-technology circuitry, replacing a plurality of in-band frequencies of a predetermined train by a plurality of out-of-band frequencies of another predetermined train by the Bluetooth circuitry.