Step 1: Step 2: Item List
"Locking sheet metal tools" provide more control. Otherwise use what you have at hand. If you live in the Matrix, then use your mind.
Step 2: Step 3: Bend Spoon
The glass of the iPhone in contact with the steel of the spoon has very little friction. You may elect to wrap some electrical tape along contact points to ensure secure positioning.
Step 3: Step 3: Enjoy
If using a bent spoon is not sufficiently eco-geek-chic to impress your entourage, you can always build yourself a "passive" hearing aid like the one shown above. http://www.audioasylum.com/forums/hug/messages/14/146149.html