According to 100 billion blogs (or there abouts), the iPhone 4 has reception issues. When you remove all the reposts and track backs, that probably equates closer to a few thousand.
In response, Apple have been giving away bumpers to customers who have experienced reception issues.
Does this solve the reception problem? Of course not. But at least it is a response for negative press.
“The iPhone 4 has receptions issues.”
“Yeah, but at least you get a free bumper.”