I was going settle for black iphone 4, but my phone still drops bars with bumper case on it. Now, I admit that the bumper does help, but my iphone 4 still struggles to maintain 2-3 bars. I don't have this issue with my blackberry 9700. Since, I wanted white iphone 4 from the beginning, I decided to just return this phone and wait for black one. What are you guys doing about your problems with your iphone 4? Anyone just keeping or returning it?