Vox.io gets really interesting, and potentially disruptive, when it comes to calls between mobile users. The mobile app is , but looks extremely easy to use. You can invite a mobile user to a call in the same way described above, and they simply accept the call and it's connected. The mobile app contains your contact list, your favorite (most called) contacts, and your call history.

You can also "search and call" wherein you search for another vox.io user using the terms "call [your friend's name here]". Stolfa searched for "call Phillip" (one of his contacts) and the vox.io link showed up third in the Google search results. He then clicked the link and a call was initiated between the two.

I tried this without having signed up for an account. I searched "call Tomaz" and sure enough, the vox.io link came up first in the search results. Thinking this might be a special case, I did the same thing for another of Tomaz's contacts, and the same thing happened. Tomaz says they made no special arrangement or keyword buy from Google to make this happen.

For now, vox.io makes its money by charging users 1 cent per minute for domestic voice calls, and 10 cents per minute for international calls. The rates are very similar to those of and Google Voice.

Tomaz says the app is really a hybrid of a free-standing app and a browser-based service. Like a web service it enjoys easy access to the web and like an app it easily exploits the phone hardware--namely the microphone, speakers, and camera.