iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus and iPhone SE work with nano-SIM cards from compatible carriers. iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus and iPhone SE work on many 4G LTE networks around the world; contact service providers for details.
Answers from the community
Totally will! They both use nano-SIM chips.
The iPhone 5, iPhone 5C, and iPhone 5S are all capable of using 4G LTE data.
Yes it will go off in airplane mode because you set an alarm and you told it to alert you
Yes. I was in Apple Store looking for 6S cases and the employee told me 6 cases fit the same as 6S.