- Keep your Sprint Number: Your Sprint number will be your Google Voice number
- Replace your Sprint Number with your Google Voice Number: Your Google Voice number will become your actual Sprint phone number. Everything you do from your phone will display your Google Voice number.
In addition to the number changes, you will also use Google Voice’s voicemail instead of Sprint‘s. Also, international calls will automatically go through Google Voice.
To get started, please follow this link. Please note that this service is exclusive to Sprint users.
Source: Google Mobile Blog