If your friend spends way too much time on their phone and you want to let them know how annoying it is, we have the prank for you.

The prank, discovered by Antonio Villas Boas of Business Insider, allows you to slow your friend’s phone down to an infuriating speed.

To start the prank go to the settings menu.

From there, proceed as follows: Developer options > About phone > Build number.

Tap it repeatedly until the following shows:

Go back to settings and proceed as follows: Developer options > About phone > Window animation scale > Transition animation scale > Animator duration scale.

From there, set the scales from 1x to 10x.

Now the phone should behave impressively slowly, much to the frustration of your friends.

Happy pranking!

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