I had a good first experience with a provider in London, so I'm thinking of exploring other providers more often.

That being said, any suggestions for a good burn phone (or SIM card provider) that I can use in both the Canada (taking a trip there soon) and the U.S.? I've done a little research and have seen I can get a cheap unlocked phone pretty easily on eBay, but I'm not familiar with cellular companies that would give me the ability to call from both countries.

Just looking for a simple pre-paid SIM card (similar to Orange's £10 card) that I can use and charge whenever I need to.

Thanks!