Aside from the push mobile app notification and email notification, you can have the option to notify your stafff via SMS.
SMS is charged at $0.09 per 160 character messages sent. Generally, a staff member with 5 shifts in a week will have their entire roster on one message. If shifts are split each day, it is likely that the roster would push into a second message
Staff currently cannot reply to an SMS roster and have that come through to a manager as a response
Managers or Admins who publish rosters are not able to add additional information to the SMS roster Zenshifts does not have a shift confirmation process through SMS at this stage.