Step 1: Get a watermelon

Step 2: Get a knife

Step 3: Put the knife roughly above the center of the watermelon

Step 4: Push down, should end up with something like this

Step 5: Get your phone

Step 6: Put the phone in one of the halves of the cut in half watermelon

Step 7: Glue the two halves of the watermelon back together with the phone still in it, should end up with normal un-cut watermelon

Step 8: Throw the watermelon on your front porch as hard as you can

Step 9: Contemplate your life choices, because you were stupid enough to do that