Your iPhone will work in Canada, as will text messaging. For us Canadians, who have among the most expensive cell rates in the world, cell phone calls in the US are very expensive (with roaming + long distance), although text messaging is free (depending on our plan). For Americans travelling in Canada, I'm not sure how your rate plans cover you, but I expect texting at least is free. At any rate, your iPhone will work for either calling or texting while travelling through Canada. I also use Skype and it works very well, and actually doesn't require high bandwidth as a previous poster suggested.