For connected Canadians venturing out of the country, one question is whether to forego Internet access while away and get caught up on emails etc. upon their return, or pay the outrageous data and voice roaming fees imposed by the big Canadian carriers. A lot of people just leave their cell phone at home so they can't accidentally rack up a huge roaming bill.
The new mobile companies like WIND and Mobilicity have better rates than the big companies, especially for travel to the US, but it's still prohibitively expensive for anything other than extremely light usage.