A portable VoIP telephony service includes a portable device that includes a processor and memory having information stored therein. If the portable device is coupled to a first computer, information is coupled via the first computer to the telephony service, and in the event a first incoming telephone call is received, the telephony service causes the first incoming call to be directed as a first VoIP call to the first computer. If the portable device is coupled to the second computer, information is coupled via the second computer to the telephony service, and in the event a second incoming telephone call is received while the portable device is coupled to the second computer, the telephone service causes the second incoming telephone call to be directed to the second computer.