The portable cellular telephone credit card calling system works in conjunction with a cellular telephone, a local cellular network and an IXC in a telecommunications network. The portable cellular telephone has a handset and a transceiver unit and a credit card and electronic control interface...http://www.google.es/patents/US5850599?utm_source=gb-gplus-sharePatente US5850599 - Portable cellular telephone with credit card debit system
Portable cellular telephone with credit card debit system
