Why SMS and Mail reminders work

A visibility problem

You send a reminder email to your client 48 hours before their appointment. It lands in their inbox, sandwiched between an unsolicited newsletter and a supermarket promotion. It might be read. Or not.

That's the fundamental problem with email for appointment reminders: even well-written, it risks never being seen at the right moment.

The difference in numbers

The data is clear. According to Mobile Marketing Association research and 2026 benchmarks compiled by MessageIQ:

These numbers matter. A reminder that isn't read within 3 hours before the scheduled appointment is often too late to act on. SMS is therefore the natural channel for any time-sensitive communication tied to an appointment.

Why does SMS perform so well?

1. Instant notification on the lock screen

Unlike email, an SMS appears directly on the phone screen without the recipient needing to open an app. This deliberate interruption is precisely what makes SMS effective in this context: it forces immediate awareness.

2. The cultural habit of texting

Americans check their phones an average of 96 times per day according to data compiled by Notifyre (2026). In France, 60% of consumers prefer to receive business communications by SMS according to WebinarCare data.

3. Minimal friction

Replying "YES" to confirm or "CANCEL" to cancel takes 5 seconds. This simplicity is a key engagement factor. Systems that allow a one-word reply achieve confirmation rates far higher than those that redirect to a web link.

Email or SMS: which one to choose?

The answer is: both, in the right order. Email remains useful for sending a detailed confirmation after booking (with address, preparation instructions, cancellation policy). SMS takes over for 48h and 2h reminders, when urgency outweighs content.

This multi-channel combination delivers the best results according to DialogHealth data: a reduction in no-shows of up to 50% compared to using a single channel.

Conclusion

Not using SMS for your appointment reminders means accepting that half of your clients won't see your message in time. In a context where every missed appointment represents a direct loss of revenue, SMS is no longer a luxury — it's an operational necessity.