US Patent 7664489 Method for communication between cellular phones

A method for a communication between two cellular phones is provided, in which the communication between the cellular phones includes an intercom communication and a telephone communication. The method includes steps of providing a telephone number of one cellular phone and an intercom number associated with the telephone number in the other cellular phone, dialing the telephone number of the one cellular phone by the other cellular phone to activate a calling to the intercom number associated with the telephone number, determining whether the cellular phones are within an intercom communication area, and performing the intercom communication therebetween while the cellular phones are within an intercom communication area, or performing the telephone communication therebetween while the cellular phones are without an intercom communication area.