July 30th, because Steve Jobs said so
The iPhone needs a sim card so it won't be sim free. You can purchase it UNLOCKED for the full price without contract which I believe is what you are trying to find out. And from the looks of it there won't be any pre-orders. But if it were to happen then Monday or Tuesday would be the latest possible dates to get a ship date by Friday.
Keep up to date in the Canadian thread here for more info:
https://forums.macrumors.com/threads/934099/