Which channel to use
| SMS | ||
|---|---|---|
| Reach | Any mobile number | People who use WhatsApp |
| Format | Short text and a sender ID | An approved utility template, optional confirm button |
| Best moment | Fallback, and customers who are not on WhatsApp | The reminder they are most likely to read |
A reliable pattern is WhatsApp first, SMS if that message is not delivered. The channel choice itself is covered in bulk SMS vs WhatsApp Business API.
What to send, and what to leave out
- Confirmation, as soon as the booking is made.
- A reminder about 24 hours before.
- A shorter reminder about 2 hours before.
- Name, date, time, branch, and one way to reschedule.
Do not put a diagnosis, a case detail, or any other sensitive fact in the SMS. The message only needs to get the person to the right door at the right time.
Utility, not a promotion
A reminder for an appointment the person already booked is a utility message. “You are due tomorrow at 4pm, reply to move it” stays utility. “While you are here, 20% off a second visit” is marketing and needs a marketing template plus a separate opt-in. Mixing them is how WhatsApp templates get rejected, and how SMS sender IDs get complaints. Country rates differ; estimate both channels with WhatsApp pricing and your SMS rate card.
Who this is for
Clinics, dentists, labs, salons, driving schools, garages, and banks booking a branch visit. The same stack — SMS gateway, WhatsApp templates, and a person when someone replies “I need to move it” — is listed by sector on industry solutions. Replies belong in the shared inbox, not on a personal phone.
FAQ
Should appointment reminders be SMS or WhatsApp?
Use WhatsApp when the customer is on it and you have an approved utility template. Use SMS as the fallback so a handset without WhatsApp still gets the time and place.
Are appointment reminders marketing messages?
No, when they only confirm a booking the person made. Add an offer and the message becomes marketing, with stricter opt-in and template rules.
Can the customer confirm from the message?
On WhatsApp, a utility template can include a button. On SMS, a reply only works if you sent from a numeric sender that accepts inbound texts. Either way, the reply should land in the team inbox.
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