We've been tipped this morning (and have now been able to confirm, thanks to our own Myriam Joire braving the lines) that if you buy an iPhone 4 in a Canadian carrier's store today, you leave with it locked to that carrier -- despite Apple's trumpeting that you can buy it SIM-free. It appears as though the activation process might be responsible for causing the carrier lock -- either that, or the carriers' subsidized models are shipped locked, unlike the full-price devices you can buy directly from Apple. Either way, it's a bummer, an
