Little Hands is a very efficient child lock app. It is really simple to use. You set a password, select what apps you want the kid to access, and press start. It locks your screen, so the kids can only access the apps you selected. All other controls and apps are blocked until you exit with your password.
Three convenient to select options:
* block incoming phone calls while Little Hands is on
* disable your wife and mobile data -- this would block internal adds in the apps your kids use through Little Hands
* disable the power button of your device -- long clicking the power button wouldn't restart your device.
No complicated settings.
No changes in the settings of your device.
No account creation.
No launcher replacement.