My organization is virtual. Do I need to provide a mailing address and phone number?

Yes, organization profiles on Kabissa require a "real world" mailing address and phone number. The Kabissa directory contains real people and organizations, and since we don't otherwise require proof of registration the contact details are important for verification purposes. In any case, even virtual organizations (including Kabissa!) are run by real people who should be reachable someplace, and the best and most accountable organizations have official contact details beyond the Internet.