My mobile (which was just sat on the sofa not being used) just made the noise it makes when either someone is trying to connect (bluetooth) or I receive a file. It said 'O2 Ice' and the options were to either accept or cancel. Needless to say, I selected cancel as I have no idea what it was - anybody got any ideas??
it will be someone with a O2 ice phone scanning with bluetooth. probably your next door neighbour or someone driving past. turn your bluetooth off to stop this hapening ang it will also extend your battery life