The best way to resolve the iPhone 4 antenna problem is to use a bumper or a case. But, Apple representatives are strictly instructed not to appease customers with free bumpers, according to a list of procedures reportedly leaked to Boy Genius Report. Apple’s bumper, which costs $29, is made up of molded rubber and plastic. It fits on the edge of the phone to avoid covering of hand over the black strip in the metal band that could result in signal strength loss.