A: Hello KMFMarketing,

Thank you for your message and your question. :)

At the moment in TidyCal, you may use an option to add a question asking for the phone, instead of the phone number or additional contacts field.
You can create any questions you need, and mark answers as required in the edit mode of your Booking type.

If you need guidance on how to create a phone number question/field or if you have additional questions, please email support@tidycal.com, and our team will try to assist you the best we can. :)

Thank you once again, and warmest regards from the Originals Team! :)