With the new app, players can add themselves as floating spares and are asked to input their phone number.
How to add myself as floating spare on the app : CompuSport (freshdesk.com)
A manager can also control the public visibility of phone numbers by inserting them in the cell phone number column and checking a box confirming you want to make them public.
Menu > Manage > Players/Teams > Players.
Menu > Manage > Event > Event. Select Event, pencil to edit or double click.
League Section.
