But an unlocked iPhone in canada is kinda like and iPhone 0.5
You can't use visual voicemail, can't really use internet whenever you like unless you want to be shafted with a $400 monthly bill, and you have the risk of an update rendering your phone unusable... I wish it would just be official already...
visual voicemail is an AT&T only feature right now.. and like someone has already mentioned.. I get very few voicemails.. but even If i did really want that service.. there is an app you can get for visual voicemail on non at&t networks..
as well, all you need to do is ensure that you dont use the edge network and stick with wifi.. I dont know where you would go nowadays that dont have wifi connections.. obviously some are locked.. but it probably isnt long until there is a wifi hacking app for the iphone
as far as the iphone being rendered unusuable... sure it might relock.. but it wont take long for them to reunlock it..