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Hello, I will be travelling to Canada for a couple of weeks as I need to attend a friend's marriage. For calling purposes, I am confused between an Android VoIP app Global Call and a global SIM card. The catch is that the calling rates through the app back to Japan are dirt cheap and doesn't require the formality of paperwork a la a SIM card. They even have contests like this https://www.facebook.com/uglobalcall/app_193371724140087 where one can win a $100 credit. Pretty sure a global SIM wouldn't be able to compete with that. Which one should I go for?