Okay, here's what you do:
First, go to a hunting store and buy a large pack of shotgun shells, cut apart the shells and retrieve the gunpowder. Use the gunpowder to bury the phone. Coat it in gasoline or any other flammable substance. Light it with a very long stick and watch it explode.
If that doesen't work, try shooting it with a potato gun, or a shotgun if you don't have a potato gun. You could also drop it off of a really tall building, too.
Either way, it should be awesome.