How to Add SMS Reminders to Google Calendar

Google Calendar can remind you, but it does not send SMS reminders to your clients. If you want automatic text reminders before appointments, you need an SMS reminder tool connected to your calendar. Etisia works on top of Google Calendar: it picks up your appointments, resolves the client's phone number, and sends reminders automatically — without changing how you book.

Keep Google Calendar. Add SMS reminders. No new booking system.

What Google Calendar does — and what it doesn't

Google Calendar is great for managing your schedule. It is not built to run client reminder workflows.

What Google Calendar does — and what it doesn't
What Google Calendar does	What it doesn't do
Sends email reminders to the calendar owner	Send text reminders to the client
Sends push notifications to the calendar owner's phone	Send reminders to people who are not using Google Calendar
Lets you choose basic reminder timing like 10 minutes, 30 minutes, or 1 day	Customize the message, add a cancellation link, or manage reminder status per appointment

That is the gap Etisia fills. You keep using Google Calendar the way you already do, and Etisia adds the SMS reminder layer on top.

How to set it up

Connect your Google Calendar

Sign in with Google and connect the calendar you already use. Once connected, Etisia can start reading upcoming appointments and preparing reminders automatically.

Already have a full calendar? You do not need to recreate anything. Existing upcoming appointments are picked up automatically. You can also create a separate calendar in the Google Calendar app for free — handy if you want to keep business appointments apart from personal ones.

Connect your Google Calendar once and upcoming appointments are picked up automatically.

Pick your SMS template

Choose from 20 ready-made templates or write your own.

Keep your message short. If it stays under 160 characters, it is easier to read and usually cheaper to send.

Choose a template or customize your own reminder without rewriting every message by hand.

Set your timing

Choose when reminders should go out. Etisia shows the most common options by default — 1 hour before (recommended) and 1 day before (recommended) — with a "Show More" toggle revealing the full set: immediate, 15 minutes, 1 hour, 2 hours, 6 hours, morning of, 1 day, 2 days, 1 week, 10 days, and 1 month before the appointment. On the Pro plan, you can select up to 3 timing windows per calendar. Starter plan includes 1 timing window.

Same-day bookings are handled automatically. If a reminder window has already passed, Etisia skips it and sends the next one.

Reminder timing is flexible enough for short-notice bookings and longer lead times.

Make sure Etisia can find the client's number

Google Calendar has no client phone-number field, so Etisia needs another way to resolve the number. You can add contacts in Etisia manually, import your existing phone contacts as a .vcf file, or include a phone number directly in the event title. Once a contact is saved, Etisia can match the client name in the appointment title and resolve the right number automatically.

Import your contacts once, and returning clients usually only need their name in the calendar event — not their number every time.

If Etisia can match the appointment title to a saved contact, you do not need to type the number every time.

Reminders go out automatically

Before finishing setup, Etisia gives you a set of additional options — all optional, three recommended. Enable cancellation links so clients can cancel via SMS. Turn on SMS feedback so reminder status shows directly on your Google Calendar event titles. Enable opt-out so new clients receive a one-time welcome SMS with an opt-out link (recommended for compliance). Toggle quiet hours so reminders don't fire overnight. You can also enable auto-contact creation and email alerts for incorrect calendar entries. Once everything is set, reminders go out automatically. The client gets a text with their appointment details. You see reminder status on the calendar event.

In the US and Canada, reminders come from a numeric sender. In the UK, Ireland, and Australia, they come from a branded alphanumeric sender ID. Clients can opt out by replying STOP where inbound is supported. The cancellation link in every SMS works regardless of sender type. See the supported countries page for full details.

This is the end state: the appointment stays in Google Calendar and the reminder workflow runs on its own.

What reminder status looks like in Google Calendar

Etisia makes reminder status visible inside the calendar you already use. Instead of wondering whether a text went out, you can see the result directly on the appointment.

Google Calendar

TODAY

TOMORROW

SUN

09:00

Lisa Miller (SMS sent ✅)

Noah Patel no SMS9:30 AM

Maya Patel (no SMS)

10:00

Sarah Johnson SMS ready ✅2:00 PM

Eva Davis (SMS sent ✅)

Emma Wilson SMS needs review ⚠️10:00 AM

11:00