When the iPhone 6s and 6s Plus were first launched, they were only available to be purchased via carriers. While subsidies are no more, what the carriers offer are installment plans that can be repaid over the next couple of years. However if you’d rather not be tied to any carrier, SIM-free iPhone 6s and 6s Plus units are now available for purchase.
If you were to head on over Apple’s online store, you will be able to select the SIM-Free option. For those who are unfamiliar with SIM-free devices, Apple write, “The SIM-free iPhone comes without a wireless contract commitment or carrier financing. It doesn’t come with a nano-SIM card for iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, or iPhone 5s. And because it’s unlocked, it isn’t tied to one carrier, so you can get a nano-SIM from any supported carrier worldwide, such as AT&T, T-Mobile, Verizon, or Sprint in the United States.”