A method of universal communication, comprising: (1) assigning user phone numbers each representing a user; (2) providing user verification and user digital signature service; (3) providing a handheld personal communication device for user verification and digital signature; (4) dynamic binding of a...http://www.google.co.uk/patents/US6744874?utm_source=gb-gplus-sharePatent US6744874 - Method of universal communication and devices thereof
