I lived in Canada for 2 years. The week I moved there is when T-Mobile started offering free unlimited roaming in Canada. In my time in Canada I kept my T-Mobile plan and didn't even have to get an unlimited plan since I already had unlimited roaming. Since my bill was sent to a Washington address, I guess I got in on some loophole. The best part was that my coverage was phenominal... I had access to Telus, Wind and Bell in my area.

My prior trip to BC scouting for a home (a month earlier) cost me hundreds of dollars in international calls and data usage. The phone plans in Canada are shockingly bad. Being able to circumvent them was a godsend.