A:Answer This phone is listed as unlocked and compatible with the following carriers: AT&T, Sprint, T-Mobile, Verizon. The WiFi calling feature is dependent on which carrier you choose. Please check with your carrier to ensure they support WiFi calling. The difference between the unlocked version and a carrier locked version is the carriers the phone can be used with as well as a locked version may come pre-loaded with applications for that carrier. ^CP
