Vox Communications is the technology company behind Vox Mobile. Vox is based in Orlando, FL. Vox created a dialer app, similar to Skype, calls between Vox users are free. Unlike Skype or Localphone, Vox is currently only available for Android and iPhone. Having missed Blackberry and Windows Phone - though that may be only temporary.
The calling rates are typically good, but a bit higher than Localphone or Rebtel for some of the typical destinations we checked (India, Brazil, China, US, Canada & Mexico). The Vox Mobile dialer will work either on Wi-Fi or using your smartphone's data plan.
As with most dialer apps; downloading the app is free and calls to other VOx Mobile users are free too; though to make calls to landlines/mobiles one has to top-up the account or select one of the monthly plans.
In all Vox Mobile may be a suitable option for students or for those whom solely rely on their mobile phone. Though there are better rates for long distance calling thus is worth comparing.