A little fruit-flavored gelatin can go a long way in the prank department, especially on April Fool's Day. So, if you've got a friend or loved one who's addicted to their smartphone, make them squirm with this jiggly jello prank.
The jello prank consists of encasing your target's mobile phone in gelatin, so when the phone rings they don't know how to answer it without ripping the jello to shreds.
It's as simple as make one batch of Jell-O in a bowel and freezing it. Then when frozen, place the phone (wrapped up securely in plastic) on top the first batch. Make the second batch and pour on top of the phone and freeze.