if its the original one before the revised addition made for the verizon phone, it will fit, BUT it covers the mute button slightly...still functional but a little off
Supposedly it doesn't. I had the replacement bumper that apple gave after release of the Iphone 4 too. When I bought the 4s, I just brought the unopened bumper to them and told them I wanted to update to the newer one. They went ahead and did it. They had to open the newer one in front of me for whatever reason.