有两个选项，第一个对我不合适，因为已经给了不少人Google voice号码。
第二个的话是不是sprint号码还是保留，打sprint号码也可以进入Google voice
mailbox？有没
有可能在用手机打电话时可以显示sprint号码？
Option 1: Replace your Google Voice number with your Sprint number
Calls made from Google Voice and Gmail will display your Sprint number. Your
Google Voice number will remain on your account for 90 days before being
deleted.
Option 2: Replace your Sprint number with your Google Voice number
Calls made from your Sprint handset will display your Google Voice number.
Enable with my Google Voice number
