Here's a solution for blackberry curve 8520 that the headset shows or in activated mode when making a call or someone calling the unto the device.
If trying to fix this problem do this some simple steps below:
1. Try to upgrade or update the blackberry 8520 firmware.
2. Pull the battery out and reinsert it back again in a few seconds.
If the above doesn't' work, you may then proceed to hardware troubleshooting.
The solution below shows a certain components that needs to be check.
Blackberry Curve 8520 headset activated mode solution
You may first try to clean the headset jack, then reheat, rework or replace the chip shown on the solution above if the problem still occurs.
