I installed belle on my phone a few days back and i am having problem while using call waiting service.
Whenever I try to receive the 2nd line caller while dropping the first line, the phone just keeps on ringing.
The keys stop responding and I have to 'Force Shut' the phone....!!!!!!!!!!
Welcome to the forum!
Try to re-install the software of your Nokia E6 using the Nokia Suite application. Go to Tools > Software Update > Re-install.
Hope this will help you buddy!