A disposable wireless telephone and a method of using a disposable wireless telephone capable of use for telephonic communications only for a limited period, and only for telephonic communications initiated at the disposable wireless telephone, within which limited period the sum of the durations of...http://www.google.com.tw/patents/US6061580?utm_source=gb-gplus-share專利 US6061580 - Disposable wireless telephone and method for call-out only
