I believe this has something to due with either the bluetooth profile on the phone and or the location of the radio antena in the phone.
It could also be the headset, but since you are citing great performance with another phone, then I would lean towards the profile or hardware of the iphone.
I have the WEP410 headset from Samsung. When it's line of site, it's great and loud. the moment something gets in the way of the 2 devices, it starts to crackle and get static. I believe this is the headset in my case, because it did it with another phone as well.
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