2 ways to do it

From Contacts for a one-off message. A workflow when the same text should go to everyone who gets a tag, now and in future.

From your Contacts list

watch it first19 seconds, then follow the steps below.

Pick who it's for
Go to CRM > Contacts. Open a smart list or filter, then tick the people. Select all picks the whole list, not just this page.
CRMContacts1 See it on the App map
More > Send SMS
In the bar above the list, click More, then Send SMS.
1 how many you ticked, 2 More, 3 Send SMS.
Write it once
Give it a name you'll recognise later, pick the number it comes from, choose a saved template or write the message. Use the tag icon to add merge fields.
Action nameSpots open next week
TextHi {{contact.first_name}}, {{location.name}} here. We've got a few spots open next week if you've been meaning to book: {{custom_values.booking_link}} Reply STOP to opt out.
The {{ }} parts fill in by themselves with your business and customer details when it sends. Ones starting custom_values need that value set up once in CRM > Custom Values. How
1 a name, 2 the number it comes from, 3 a saved template, 4 the message.
Choose the pace, confirm consent, send
Send all at once, at a scheduled time, or in drip mode (a set number every so often). Tick the box confirming these people agreed to hear from you, then Send SMS. It can't be undone, so check it twice.
1 now, later or drip, 2 confirm consent, 3 send.
tipPaste the text into the SMS calculator first. Over 160 characters it costs two texts per person.

When it's done

The right people get one clear text, and opt-outs are handled automatically.

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Put a whole list into a workflow at once, one person by hand, or anyone who gets a tag.