A mobile phone and a communication method thereof are provided. The mobile phone includes a mobile phone body and mobile phone accessory, wherein the mobile phone body includes a first communication module, a mobile phone card information reading module, a data transmission control module and a basic communication module; and the mobile phone accessory include a mobile phone card, a storage module and a second communication module. According to the mobile phone and the communication method thereof, the user data is stored in the mobile phone body and the mobile phone accessory separated from the mobile phone body; the mobile phone body and the mobile phone accessory are interconnected by wireless communication; and when the verification for the identification of the mobile phone body and the mobile phone accessory is failed or the communication therebetween is disconnected, the mobile phone body clears all the user data stored thereby automatically to prevent the user data from being stolen, therefore, the security of the user data is improved.