Hi Chris,
No, AC reminders block night time calls/txt. You can set the hours that reminders are sent out.
I've been using for 2 years I think. It does cost a lot. But with manual texting there's a lot of room for errors. Manually calling is fine but we just don't have the manpower to do it more than the day before. (I send automatic reminders 3 days before because we want to see openings in the schedule more than just 1 day before.)

Serene
Office Manager
General Pediatrics
Houston, Texas