Sebastian is right about using UDT instead of the legacy Contacts module (and not just because he's part of the UDT team).
When I give DNN training, even when the Contacts module was still available, I never included it (I removed that module from the site). I always directed users toward the UDT instead. The Contacts module rendered the information in a table and was sortable (just like the UDT). The problem was that you couldn't remove, add, or rename fields.
If memory serves, the fields in Contacts were: Name, Company, Phone1, Phone2, EMail. You can create a UDT with these fields (text for all fields except EMail which is an EMail field).