Apple selling unlocked iPhone 6S and iPhone 6S Plus in United States.
The SIM-free iPhone 6S has model number A1633. Its larger features the model number A1634 and the both device 6S and 6S Plus requires the retail price in full at the time of purchase.
The iPhone 6S starts at $649, while the iPhone 6S Plus starts at $749. Today Apple launch iPhone 6S in european markets as well as mexico.