Такова нещо като безплатно---няма!!!
Не разбирам въпроса ти?
А за Voipstunt и Gizmo не бих желал да предъвквам темата .
Тук и на Kaldata.com вкл. и на Data.bg можеш да намериш доста неща за тях.

Ето какво пише за Гизмо:
*No purchase necessary. The All Calls Free plan applies when both call participants are registered and active Gizmo Project users. A person is considered active when they make a few phone calls per week with Gizmo Project and don't abuse the plan. In countries where free phone calls are not available, when calling a non-free number in an All Calls Free-listed country, or when calling a non-active Gizmo Project user, calls are subject to our regular low rates. As with all of our services, the All Calls Free plan is subject to the Gizmo Project terms and conditions and end-user licensing agreement.