Make the mobile telephone field compulsory on your booking form
If you like to send SMS to your guests then you may want to set the mobile telephone field compulsory on your booking form to ensure the guests adds this at time of booking.
1. Go to Admin > Customisation options.
2. Click "Customisation" next to your website.
3. Scroll down to the heading "Compulsory fields in booking form".
4. Tick "Show mobile field" AND "Mobile telephone".
5. Click Save