Sprint Nextel Corp. will offer Google Inc.’s Google Voice on all Sprint phones, and it will allow customers to use their existing Sprint wireless phone number.
I’m not sure if this means your telephone number is now a lifetime number? One of the features of google voice is that you can keep the number after you move. It can be used with any plan old telephone service provider and notifies you online when you have received a call. Using caller ID your google number can have a custom ring tone on your cell phone to keep your friends and business calls separated.
Google voice also allows people to call you for free using a widget that you can place on your website.