Now might be the time to consider upgrading your iPhone, if you haven't already. According to 9to5Mac, Apple will begin selling SIM-free, fully unlocked versions of the iPhone 6 and 6 Plus in the U.S. on January 6. They should be available in both Apple's brick-and-mortar retail stores and online store.
Why this matters: Currently, Apple requires you to buy the iPhone 6 or 6 Plus alongside a contract with your carrier--or unlocked and unsubsidized if you're with T-Mobile. Making the iPhone available without a SIM card means that customers can use the phone with any carrier around the world, or switch carriers at any time without having to worry about compatibility.
This isn't a new move for Apple--the company releases fully unlocked versions of the iPhone shortly after each new model's initial debut--but as 9to5Mac points out, the unlocked iPhone 6 and 6 Plus models are being released later than usual. Apple has typically released unlocked versions about two months later--perhaps manufacturing demand caused the slight delay.
As for pricing, it's likely to match T-Mobile's structure, starting at $649 for the iPhone 6 and going up from there depending on the model and storage space.
Macworld reached out to Apple for comment, and will update this story with any additional info we find.