Apple has started selling SIM-free iPhone 7 models in the U.S. online Apple Store, allowing customers who wish to purchase an unlocked iPhone outright without signing a carrier contract the opportunity to do so. A new “SIM-free” option now appears on the iPhone 7 and iPhone 7 Plus ordering pages as an alternative to the traditional carrier selection options. As the SIM-free iPhone models are not subsidized by carrier contracts, customers…