Magnetic pay telephone cash box proximity switch

Method and apparatus for authorization based phone calls in...

Method and apparatus for awarding and redeeming prepaid telephon

Method and apparatus for awarding and redeeming prepaid...

Method and apparatus for awarding and redeeming prepaid...

Method and apparatus for awarding and redeeming prepaid...

Method and apparatus for detecting and announcing pin fraud on c

Method and apparatus for electronic payphone open switch interva

Method and apparatus for executing automatic calling card access

Method and apparatus for extending a pre-paid calling card limit

Method and apparatus for extending a pre-paid calling card...

Method and apparatus for facilitating the making of card calls

Method and apparatus for internet-based telephone access to...

Method and apparatus for keyboard adaptation to a low power cont

Method and apparatus for portable pay phone

Method and apparatus for preventing pay telephone fraud and redu

Method and apparatus for preventing pin fraud on coin telephones

Method and apparatus for preventing return dial tone fraud in a

Method and apparatus for processing telephone calls charged to c

Method and apparatus for processing telephone calls charged to c