A network listening method of a mobile phone is provided. The mobile phone includes a code division multiple access (CDMA) chip and two user identity module (UIM) cards. The network listening method executes a first network listening method to listen to a communication network, if a listening frequency of the first UIM card equals a listening frequency of the second UIM card and the listening channel of first UIM card equals the listening channel of the second UIM card. The network listening method further executes a second network listening method to listen to the communication network, if the listening frequency of the first UIM card does not equal the listening frequency of the second UIM card and/or the listening channel of first UIM card does not equal the listening channel of second UIM card.