Yeah. I just read my post. It's a confusing. Sorry. I didn't describe your tests properly. What you actually did is use Telus/Bell SIM cards with unlocked iPhones.
Here's what I really meant:
Telus/Bell SIM card may not properly work in the new iPhone, since Telus and Bell are not GSM providers. They are CDMA. Plus they are notorious for locking their equipment in any way possible. They may install on their SIM cards some kinks that prevent them to work with other operators. Surely, they support HSPA 3G frequencies, that are compatible with iPhone 4, but I wouldn't trust them. So, still it's not proper test. Proper tests would be to use unlocked Canadian iPhone with other GSM providers. I will try to use Rogers card when my friend buys new iPhone, but still those tests are not 100% accurate as well, as my iPh 4 uses Fido (same company).