I have a blackberry curve 8310. I want to use it to listen to MP3 music but the headset that came with it sounds like crap. I purshased a high quality headset that is disigned without a microphone in it. The pulg size is the same (3mm) but it has only the three divisions on the plug and NOT the fourth one for the microphone. I have pulgged it into my BLackberry and it works. It sounds great. WIll this do any damage to the unit since it's plug only has three sections and not four?