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Send WhatsApp and SMS to the contact number

Learn how a workflow reaches guests by WhatsApp or SMS even when the booking has no phone number

Updated on November 6, 2026

Many booking pages don't ask for a phone number. A WhatsApp or SMS step can then use the number from the guest's CRM contact.

Choose the recipient

Open the WhatsApp or SMS step in your workflow and pick one of these actions:

ActionWhich number is usedWithout a number
Send to booking or contact numberThe number from the booking, otherwise the contact's numberWhatsApp is skipped, SMS goes out as an email
Send to attendeesOnly the number from the bookingWhatsApp is skipped, SMS goes out as an email

New WhatsApp and SMS steps in booking workflows start on the booking or contact number. Existing steps stay as they are until you change them.

Good to know

  • Group bookings: Each guest gets the message at their own number. If one guest cancels, only their messages stop.
  • Contact and booking stay unchanged: The number is only read for sending and is not copied onto the booking.
  • Consent still applies: A contact who declined marketing messages doesn't get them. Meeting messages such as confirmations and reminders still go out.
  • Trial: Trial accounts don't send SMS or WhatsApp messages.

Red notice on the step

If no guest had a number, the WhatsApp step shows a red notice in the workflow. SMS steps don't need one, because the guest gets the message by email instead. It tells you what to do:

NoticeWhat you can do
No guest gave a number, but their contact has oneSwitch the step to the booking or contact number
No guest gave a numberAdd a phone field to the booking form
Neither the booking nor the contact has a numberAdd a phone field to the booking form

The notice clears after the next successful send or when you change the recipient. Skipped WhatsApp messages are not sent later.

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