Patent Number: 6,434,378

Title: Pre-paid cellular telephone system

Abstract: A pre-pay service unit uses pseudo-numbers to identify subscribers and substitutes actual numbers to complete a call after verification of authenticity and verification of a positive balance in a subscriber's account. The service unit and the cellular telephone exchange data in the process of authentication. For outgoing calls, a cellular telephone first transmits an "800" number and an ANI. The "800" number is the telephone number of the pre-pay service unit, which then requests number actually dialed. The cellular telephone responds with dialed digits, a security code, and status data. If the information is correct, the dialed digits are then passed to a local exchange carrier to complete the call. For incoming calls, a pseudo-number directs the call to the pre-pay service unit, which converts the pseudo-number to the actual telephone number of a subscriber's cellular telephone.

Inventors: Fougnies; Douglas V. (Tempe, AZ)

Assignee: Cellexis International, Inc.

International Classification: H04M 17/00 (20060101); H04Q 7/38 (20060101); H04M 011/00 ()

Expiration Date: 08/13/2019