Vtokapp.com allow free voice and video calls with our Google Talk contacts. Vtok is available for Mac as well as Windows. Vtok on mobile is available for both iPhone and Android Users. Yeah, works on iPad and Android Tab as well.
Vtok does not require to sign up, it just uses your Google account. Vtok works good on 3G or Wifi! And yes, it allows calls to other Vtok or Gtalk users. You can call to your friend on Pc using Vtok on Mobile. This way make Pc to Phone Calls or Phone to Pc calls!
Install Vtok in your mobile, Just sign into the app using your Google (gmail) username and password and start calling your gmail contacts.
Vtok is supported on iPhone4, iPhone3GS, iPad2, the 4th generation iPod touch (with a front facing camera) and all Android phones running OS version 2.1 or later. Vtok is a cross platform app. You can choose between front and back camera on your device.
Please note that Vtok is an independent application that inter operates with Google video chat and is not endorsed by or affiliated with Google.