It's something that google is testing. It's free, they give you your own number, you can text people from it, call people from it, visual voicemail with transcripts, see all your missed, received and placed calls. Forward to as many phones as you want to. Screen calls. Listen to people leave you voicemails (its called ListenIn). You can call anywhere in the USA for free. Comes in handy at work if you can't call long distance.