It seems not everyone is impressed with the "breathe" function on the Nokia E72. One of the readers turning in to our MyE65 blog couldn't figure out what was causing his phone to slowly pulse or flash a white light coming from the Opti Navi Key. Eventually they found out from Nokia that it is the "breathe" function which pulses a gentle light to let you know where your phone is in the dark. When you miss a call, email or SMS, the slow pulsing light becomes a more urgent flash. So if you do not like the flashing? This is how you turn it off:
Go to menu, control panel, settings, general, personalisation, notification lights, standby br.light, select off.