Ring Tone setting

When you want your phone's ringer on but want certain callers to go unnoticed, use the No Sound ringtone.

1 Select an empty Favorites box.
2 Select Speed Dial from the Type pick list.
3 Select the Lookup button, find the person in your Contacts address book, and select it.
4 Select the Ringtone pick list and select No Sound. Select OK.

Zolved - How do I avoid getting calls from a particular caller on my Treo 650?