1) Workers on prepaid cell phones don't have access to a calendar. (Many don't even have email addresses.) 2) When workers are onboarded via text message, we s

1) Workers on prepaid cell phones don't have access to a calendar. (Many don't even have email addresses.) 2) When workers are onboarded via text message, we send them an ical links so they can add the schedule to their phone calendar directly! 3) Calendar invites don't scale well beyond 5 employees. We've seen it in user studies. It's ugly and hard to use.