An operation method for a mobile electronic device is provided. The operation method includes: transmitting a calling phone number to a wireless audio product from an operation system of the mobile electronic device via wireless communication, wherein the mobile electronic device is wirelessly connected to the wireless audio product; transmitting the calling phone number to an application software of the mobile electronic device by the wireless audio product; searching a caller name corresponding to the calling phone number by the application software of the mobile electronic device; transmitting the caller name to the wireless audio product by the application software of the mobile electronic device via wireless communication; and playing the caller name by the wireless audio product.