Google just announced that its integration with Sprint’s wireless service is now live. Sprint users now have two options: turn your Sprint number into a Google Voice number so that your Sprint number will ring all your other phones, too, when somebody calls – or turn your Google Voice number into your Sprint number and replace your current mobile number. Either way, Google Voice will now replace Sprint’s voicemail system and international calls will be routed through Google Voice, too. Porting numbers between Google Voice and Sprint will be free.

These new features are, of course, optional. Users can also continue to use their current Sprint service without switching to Google Voice. Detailed instructions for those who do want to switch, though, and make use of Google Voice’s free voicemail transcriptions, cheap international calling rates and other features, can be found here.