My free bumper for my AT&T iPhone 4 essentially fell apart from normal use over the past year. I went to the Apple store and they provided me with a free replacement (after a little negotiating). The bumper is slightly different and I assume is to accommodate the differences of the Verizon 4 and the 4s. I am finding that my phone is often being muted due to this new bumper. Often when I take it out of my pocket I notice that the mute switch is half triggered. Has anybody else noticed this? Do they still carry the old bumpers at the Apple store?