I keep the Bluetooth always turned on with my iPhone and carry around a Plantronics Voyager 510 to use with it. If I haven't used the phone for a couple of hours and someone calls me, my headset is really slow to respond when I press the headset button to answer. Half of the time my iPhone may not even recognize that the headset is on and sitting next to the phone. This only happens after inactivity with the phone for a couple of hours. After ending a call, if someone calls me again in the next ten minutes I don't have the same problem. I didn't have this problem with my old phone and the same headset. I just don't know what the problem is. Has anyone else experienced this? It's almost like one of the two devices is in some sort of sleep mode and can't wake up fast enough. Just wondering if this is an inherent problem with the iPhone or if I need to start looking at new headsets? I just didn't want to invest in a new headset if it was going to do the same thing.