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The microphones on the h710 seem to be very susseptable to moisture. My first one failed to work after soaking in coffee,,,oops! My seocnd one worked great until I was out working in a field and had it in my shirt pocket. My shirt was damp with sweat. Never worked right again. same issue, I can hear just fine with it but person at the other end say they can hardly hear me. too bad, I lobe it, but they are unreliable
Try adjusting the volume not only on your bluetooth but also on your phone as well. The 2 volumes are not associated with each other at all. If that does not work still, your Bluetooth may not be compatible with your phone or you may have a defective bluetooth. Make sure you within 18 feet of your phone when talking on your bluetooth. Hope that helps!
I had the exact sane problem! Im with rogers so I brought it to the rogers booth the said it could be the blackberry itsself but I had just gotten it a week ago so it couldnt be it then they figured out I didnt put in my sim card properly so maybe it could be that
perhaps it is in "mute mode" which can be activated on the headset itself by simultaneously pressing both the up and down volume buttons.
Also, have you tried deleting the device from the phone you are using before you pair it up again?
finally is there any firmware/software update available for the phone? This can be the case frequently with bluetooth problems with Blackberry devices (I know this from painful experience with this same headset).