Spare Phone - Google Voice VoIP Client - Make calls over Wi-Fi
Spare Phone uses your WiFi,3G,4G data connection to place and receive FREE Google Voice VOIP calls. All you need is Spare Phone, a data connection(Wireless or Mobile) and a free Google Voice account. Now you can turn your Android tablet or phone into a free wireless phone with Spare Phone!
Android Market Links:
If you have any questions please let me know!