请看刚才查询到一个truphone号码实例 （Nov 19， 2016）：
Porting your mobile number to Google Voice is unavailable
Your mobile number can not be ported at this time.
- This number appears to be from an area we don't currently support for
porting.
- We currently don't support porting from your carrier. We apologize and are
working on adding support for more carriers.
查询同一个地区的R＋ 号码，就只有一个原因：
- This number appears to be from an area we don't currently support for
porting.
所以，Truphone暂时不能转入GV，也就是说，不能作为曲线救国转入GV的媒介。
