I do!You don't need one anyway, it's a blessing!
(You do if you abuse your phone though)

In year 10? I had batteries in my pocket and my keys, they made an electrical circuit and I ended up burning through my jeans and burnt my skin. Got sent out from the science class for swearing and trying to take my jeans off. True story.
Ha I had two batteries for my walkman
and some coins in my shirt pocket at school once. They made a circuit in the pocket, and burnt through to my lady lumps, i've still got a scar on one of them now where it briefly caught fire 

.