It is not VoIP but provides web activated telephony. So you are just initiating the call over the internet but the call itself works like a normal one. So after you initated the call from your BlackBerry with BBCalls, your phone rings, you pick it up and the phone of your contact rings, he/she/it picks it up too and you will be connected
BBCalls is free for use. Please take a look at that
i considered something free when it uses with ur data plan instead of ur voice plan. it would be great just to pay the data w/o the voice plan and go with skype or some other voip company where u pay a very low rate to make phone call demostically or internationally.
whoever can make this software for not only blackberry devices which include all the cell phones out there that can get data will become a very rich man.