Just to be clear, I haven't had any problems with my Voyager Pro when using it to talk with my Iphone 4. No disconnect issues or anything. My issues have been using the A2DP functionality to play music and podcasts through it. I have found numerous posts by others that have stated when they are outside or the phone is in their pocket, (either one) that the phone cuts in and out when playing audio. I'm having the same problem. I have an Iphone 4 and I contacted Plantronics support who sent me another Voyager Pro HD that does the same thing. When I told them, their response to me is below. I'm trying to get a refund now because the main reason I upgraded was because I wanted to play music and listen to podcasts wirelessly when I workout. I didn't notice the problem until I started using it outside.
Hello Robert,
Unfortunately, it may be the case that you'll simply have to find an alternate method of using the headset. The Bluetooth connection may be disrupted by jarring movements such as those produced by riding a bike or running. You may have to find a way to stabilize the headset if that's how you want to use it. Please let us know if you have any other questions.
Thank You,
Plantronics Customer Care
According to ron7624 the HM1700 doesn't have this issue so I'm going to give it a try. The other headset that I've found according to reviews that works well with the Iphone 4 and A2DP is the Motorola HX550. Since it's more expensive than the Samsung HM1700, I decided to go with the Samsung first.
If your problems continue, you might try what ArtMom1 recommended in this thread and see if that helps.
Good luck,
Robert