Most people I try to talk to using the bluetooth complain that they can't hear me even whn I almost shout.

Since it is Bluetooth, you have to pair the Bluetooth to your host computer or device. Find the correct window or screen and put it into discover mode, do the same with the headset. RTFM

I can hear using my bluetooth, but the person i'm talking to can not hear me.

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the earplug of your headset is defective.replace it

Bump. I have the same problem - same headset, same 3GS.

depends on your phone. If its the iphone its cause you have to answer using the bluetooth. however you answer it is how you talk.

This could be caused by a software error in which the phone still thinks the bluetooth is still connected and is still being used as a microphone you can try a couple things here: 1. go to your bluetooth device list on your phone and delete the device 2. try to connect and then disconnect the bluetooth device and see if that returns everything back to normal 3. when you are calling or get called select the blackberry menu which is basically the blackberry icon on the keypad and go and find the option activate headset or something close to that which should activate the speaker on phone which you use for your ear.

I hope this helps,
Kyle

This is a Normal problem, remeber the echo is for the mircrophone is in the same place like the speakers, & dont have a noice cancelation system, I recomended to use a bluetooth earphone

Assuming you have the audio volume turned up, do you have a bluetooth headset? Check the Bluetooth options to make sure there are no associated bluetooth devices (or just turn bluetooth off).

If that still doesn't work, try clicking the trackwheel and seeing if it says "Mute" or "Unmute" respectively.

If you still can't hear the callers voice, you may have a defective earpiece in the phone and it's time for repair. If you don't have a bluetooth headset, you can try to use one of those to hold a conversation. I have my bluetooth headset around my neck at all times, I can't stand talking without it. As an added bonus, people who can't see my earpiece in my ear thinks I'm talking to myself.

TAKE THE BLUETOOTH TO AN AUTHORISED SERVICE CENTER.