Skype is pretty good if you are on wifi. I can use it on 3G in Rio but it is less good in the states. I put this to the fact I tend to be in the car and moving around. If I use it on the street in Rio, I am walking or in a taxi and not moving that fast. So less tower switches etc. I might look into Vonage. My girl and I use facetime or Viber to talk to each other as it is a better picture call.
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