There are a few ways that you can sneak your phone into school with a metal detector. The first way is to put it in your sock or shoe. This will work if the detector is not set to a high sensitivity. Another way is to put it in your waistband and wear a baggy shirt over it. You could also try taping it to your body under your clothes. If all else fails, you could try hiding it in someone else's backpack or locker.