Detailed at http://wiki.civicrm.org/confluence/display/CRM/CiviVolunteer+dev+notes#CiviVolunteerdevnotes-Reporting
https://github.com/civicrm/civivolunteer/pull/85 https://github.com/civicrm/civivolunteer/pull/90
So for future reference JMA put 21.5 hours into this.
Added phone number to report and I think it's in good shape now.
https://github.com/civicrm/civivolunteer/pull/85
https://github.com/civicrm/civivolunteer/pull/90