How To Hide Any App On iPhone - iPad Up To iOS 9.2 *Apps Come Back By Restarting. Read Description
The hidden apps remain accessible from Spotlight Search, and come back when restarting your iDevice.
Alternative method: If you hide apps by this way ⬆️ everything stays where you left off when turn off your iPhone.
You can keep your apps permanently hidden in invisible folders; when reboot, everything remains so.
The downside is that you can not do it with any wallpaper, only works with grey background.