Hi, I got this ear piece which I use on my nokia 6021. I notice that if I were to switch it on so that if there is a incoming call, I can on the earpiece to talk. The problem is I realise the battery on the phone frequently went flat easily. How do I prevent that? I tried only switching the earpiece on when the call has been connected. But searching for that option is very difficult during a call. Anyone with advise?