[carrera.owner]

I cannot speak for your Canada trip, but when I was conducting a 6-wk experiment off the coast of Chile, the international data plans from AT&T were ridiculously expensive. So my solution was to use the hotel's wireless network and Skype iPhone app. Worked well enough to make calls. If you do decide to take this route, be sure to turn off cell service (to avoid incurring costs): I did this by putting the iPhone in airport mode and manually turning on WiFi.

HTH