A distributor of prepaid wireless services provides a prepaid card representing an amount of prepaid wireless service that may be applied to any of a plurality of wireless service providers. Prepaid cards applicable to any of several wireless service providers are sold at retail points of sale and activated...http://www.google.com.au/patents/US6745022?utm_source=gb-gplus-sharePatent US6745022 - Multiple service provider prepaid wireless service card
