Apple has started selling contract-free iPhone 6 and iPhone 6 Plus in retail stores and online. The 16 GB base model iPhone 6 costs $649 with higher tiers costing $100 extra. The iPhone 6 Plus starts at $749.

Unlocked iPhones can be activated for use any carrier, AT&T, Sprint, Verizon or T-Mobile.

Apple has offered contract-free iPhones in other regions since launch.