Yep, I agree that roaming charges account for most of the damage. Our data rates are still comparatively high, but not that high.

Canada has GSM and CDMA networks that pretty much overlap each other in coverage. Smart phones on either system use a SIM card; older phones do not. Obviously, you can't take a phone or SIM card from one system and port it to the other.

Rogers is the primary GSM carrier, and they're not going anywhere --they're in it for the long haul. Definitely not being phased out, though they may put more marketing emphasis on some regional markets as opposed to others.