A wireless telephone debit card communications system comprising a radio telephone, a base station, and an end station. The radio telephone includes a processor; a reader for reading a credit amount and a telephone number of a debit card; a writer for changing the credit amount and the telephone number...http://www.google.com.au/patents/US5359182?utm_source=gb-gplus-sharePatent US5359182 - Wireless telephone debit card system and method
