[ Version ( since = "0.4.0" ) ]
public string uri { get; set; }
An optional "tel URI" used to represent the number in a formal way.
Useful for programmatic access, such as a VoIP/PSTN bridge.
For more information, see the <ulink type="http" url="http://code.google.com/apis/gdata/docs/2.0/elements.html#gdPhoneNumber">GData specification</ulink>.