I can't seem to figure out the charges that I have to pay when...

I can't seem to figure out the charges that I have to pay when using World Phone internationally. Do I bypass international call roaming fees, but use roaming data to access VOIP? Does this mean I need to pay the data roaming fees as well as the World Phone call rates?


"World Phone uses VoIP for the “first hop” to let you bypass expensive international roaming rates when traveling. Crucially however, World Phone then connects you straight into a nearby telephony point of presence, wherever you are travelling, minimising how far your call has to traverse the Internet. Our Internet-Path-Minimisation strategy delivers you, the end-user, much improved call quality and reliability versus regular VOIP services, at a much lower cost than when using cellular roaming."