You don't need the power button to restart your Android. If yours is broken or you simply want options, here are two.
Open the Settings app. You can do this by either tapping Settings within the App Drawer, or tapping the gear icon in the Notification Shade. From within Settings, tap "About phone," and then scroll to ...
The touch-sensitive Camera Control button on Apple's latest iPhones takes some practice, but with these tweaks, you'll be ...