Set a ring tone for a profile

On most Nokia devices, you can specify a different ring tone for each profile. On a Series 60 device, you can just open the Profiles application and select the Options>Personalize menu. When you open the "Ringing tone" item, you are presented with a list of all audio files stored in the device (i.e., in the Gallery). You can choose any of these audio files as the default ring tone for this profile.

Your phone should have come with quite a few ring tones pre-installed. To hear a ring tone, scroll to it in the list and pause for a few seconds.

On a Series 40 device, you can select a profile from the Settings Profiles menu and then select Options>Personalize to change ring tones. If you want to select a ring tone from an audio file in the phone's default Gallery folder, choose the Open>Gallery item in the list of available ring tones.
On Series 40 devices, you can use the Settings>Tone settings menu to customize ring tones and alert settings for a currently active profile. On some devices, you can also navigate directly to an audio file in the Gallery and then set it as the ring tone for the current profile via the Options menu.