my question is really are there free apps that allow you to use the internet VOIP to make phone calls to all cell phones and land lines. Meaning most apps I see you must have both cell phones download the apps to make this work. I'm looking for an app that would allow all calls to be made with out using your allotted cell phone minutes. is this possible? What is the difference between Wi-Fi VOIP and 3G VOIP? Are either truly free as stated above?