Hey I'm using viber on my iphone and its brilliant and love it but i have a few questions about it im going away on holiday to Scotland for 2 weeks and i want to use viber phone calls to call my fiance in ireland and i will only have 3g so if i make a call to him using viber will my phone credit be charged and also what happens if my fiance calls me on viber and we both have 3g will i stil be charged for the phone call