Your phone has various setting groups called profiles, which you can customise with ringing tones for different events and environments.

Select Menu > Settings > Profiles, the desired profile, and from the following options:

• Activate — to activate the selected profile.
• Personalise — to change the profile settings.
• Timed — to set the profile to be active for a certain time. When the time set for the profile expires, the previous profile that was not timed becomes active.