I had that problem (the popping and hissing) with my 7100T. I went through 3 different headsets and the problem never was solved. I even ordered an exact replacement of one of my more favorite headsets and it was the same thing. I completly wiped my phone and reloaded the OS and added programs one at a time. This fixed the problem. I now have a decent connection with my bluetooth. Try reloading your OS. Good Luck!!!