Oddly, I continue to have "acceptable" performance with my recently new BlueAnt V1 through my iPhone 4. "Acceptable" defined as: good 30' range, very very few dropped connections, and moderately good voice clarity (using the "Max" noise cancelling setting on the V1 at all times, even in quiet environments).
One thought occurs to me as to why this combo may be working. My ip4 is protected in a Seidio Convert case. If you are familiar with this case it is actually a three-layer design: an inner two-piece hard case, covered with a silicon shell, covered in a skeletonized hard shell. My point is that this multi-layer case is adding a significant boundary layer around the ip4 sexy but problematic perimeter antenna design.
So whether the ip4 is being carried on my belt in the Convert's holster, or laying on my desk, the connection is consistently strong with very rare disconnects.
Your mileage my vary.
[While I was typing out this reply, part of my brain kept screaming, "Yeah-yeah, but this is an APPLE product!!! Why should you have to resort to all these freaking extra measures just to get 'acceptable' performance from an APPLE PRODUCT??!!" It's pathetic that this thread even exists, isn't it? Not to mention the fact that it's existed soooooo long...]