Josh Lowensohn/CNET

People who like their phones unlocked and SIM-free can now pick up an iPhone 5S in that state directly through Apple.

Available via Apple's online store, the new unlocked iPhone 5S requires a GSM-compatible SIM, which means it'll work on AT&T and T-Mobile but not on Sprint or Verizon. It also means buyers will have to pick up a SIM from their carrier of choice.

With no carrier subsidy, the phone sells at full retail -- $649 for the 16GB model, $749 for the 32GB edition, and $849 for the 64GB version. An unlocked iPhone 5S that comes with a T-Mobile SIM has already been on Apple's Web site selling at the same prices. Apple promises a ship time of one to two weeks for the SIM-free edition and three to five business days for the unlocked T-Mobile version.

Consumers curious about the pros and cons of an unlocked iPhone should read Apple's "About the Unlocked iPhone" Web page.

(Via Boy Genius Report)