Where is the iPhone SE sleep / power button?

iPhone SE button layout

The iPhone SE power button is located on the top of the phone, just like the iPhone 5s.

Anyone upgrading to the iPhone SE who has not used an iPhone 6 or later will not have to change their habits when putting the device to sleep. On the iPhone 6 and iPhone 6s, Apple threw everyone for a loop by locating the power button on the right side of the chassis. For many users, this change took some time to get used to before it felt natural.

Since all of the iPhone SE buttons are in the same place as those on the iPhone 5s, cases for the iPhone 5s can be used on the iPhone SE.