[MoeBerry]

When i use the bluetooth headset with my phone and someone on the other end is talking.... I am unable to interrupt them, they cannot hear me while they are keeping a constant sound on the other end.

I have the same problem on my Nextel 7520

[martin_j001]

This is known as "single duplex"...."full duplex" would imply that both parties in the call can talk at the same time. If I'm not mistaken, the speakerphone is the same way. I'm personally not sure if/when this has changed in later bb's as I've never personally noticed it....

[MoeBerry]

This only happens on my 7520 when i upgrade to the newest handheld software (the version that allows you to hide sent mail and filed mail)

The version prior to that has no problem with the bluetooth and both parties can hear eachother fine.