Windows Phone 7 - 获取本机号码？

一个朋友问如何获取wp7上的本机号码, Windows.Phone.Tasks命名空间下没有相应的类支持，搜索了一下，好像目前暂不支持：

the compulsory windows live id will not be available to developers (at least at this stage). Presumably this is to protect the consumers identity - I believe the same restriction will be in place for the phone number.

来源：msdn forum