i use mp3 ringing tones on my n70 but some times it just decides it doesn't want to ring!!its usually when I'm using the maneging function .is this a problem or some weird batt saving 'feature' that nokia have put in. i also have full screen caller running.

same happens to me actually
i use aac ringtones and sometimes the phone just DOESNT ring, whichever ringtone or profile i select
im not using any other 3rd party software in the background either
so it must be a bug!