Does anyone know if the update 4.01 release does anything to help the performance of bluetooth headsets. I have used a Jabra JX10 Series II model with the iPhone 3GS and it was great. I could use it and walk around even 20 feet away before realizing I had left the phone in the other room. Now even with a case on the iPhone 4, there's problems with complaints from folks who say the signal degrades. Sometimes it is doing so from even two feet. I had added a Best Skins Ever all around and that seemed to help in addition to the case. But not so much now. One friend said, like your phone but hate talking to you on your iPhone 4 now. Will the new update help? What's folks experience now with using a bluetooth headset?