Radiotelephone credit card data communications

Radiotelephone system adapted to read a credit card

Self configuring data card terminal

System and method for performing a variety of transactions havin

System for accessing amenities through a public telephone networ

System for accessing amenities through a public telephone networ

System for accessing amenities through a public telephone...

System for accessing and paying for amenities using a telephone

System for remotely crediting and billing usage of electronic en

Systems and methods for operating data card terminals for transa

Systems for requesting services using card reading terminals

Telephone accessory communications device

Telephone based credit card protection

Telephone based credit card protection

Telephone data collection device

Telephone network credit card calling apparatus and method of op

Telephone network credit card calling apparatus and method of te

Telephone service payment system using a sound emitting token

Telephone transaction processing as a part of a call transport

Telephone transaction processing as a part of a call transport