Pay phone call control apparatus for allowing calls using pre-pa
Pay-per use for data-network-based public access services
Payphone management system
Pre-paid phone card system with promotional link
Pre-paid phone card system with promotional link
Preferred billing rate pre-paid telephone calling card
Prepaid calling card external/adjunct database processor
Prepaid cash card
Prepaid limited usage calling card
Prepayment data transmission system
Public telephone set