MobileGlobe allows you to place cheap international calls from your Iphone without changing the way you call.
Completely seamless, it does not require anything from you. Just dial your number with MobileGlobe, and your call will be so much cheaper.
And you do not need a wifi connexion.
Quality of call is perfect
Keep your current mobile operator, your current plan, your phone number. You do not change anything. You just pay less.