Why a client didn't get a reminder

Look at the booking's label in the day view (What the labels on bookings mean), and at Activity. The usual reasons:

• It was booked less than 18 hours ahead. Reminder texts need 18 hours. A client who gave an email gets an email instead.
• It was booked after that evening's reminders went.
• The client gave no email, and the shop is on Basic, or reminder texts are off.
• You added it yourself. On Basic, that means no reminder; on Pro, only a text, if you entered their mobile and it was 18 hours or more ahead. (Messages for bookings you add yourself)
• The day's limits were reached. A mobile gets at most three texts a day, and an email address three emails, from every business together, and each shop has a daily email limit. Activity says "the day's email limit was reached".
• It didn't send. Activity says it "didn't send". When a text fails, a client who gave an email gets an email instead.
• It says "Reminder unconfirmed". It may well have arrived. It isn't sent again, so nobody gets two.
• Your subscription has ended, so texts have stopped. (Restart after cancelling)