How to require 10 digit phone number

Is there a way to require 10 digits be entered when a phone number field is filled in? We offer three phone number fields, cell, home and work so don't set the field as required.

Thanks,

Jim

You can achieve that with Short Text entry (Text Box) field and setting Input Mask.

Here is my demo form: https://form.jotformpro.com/71240634626957 

Feel free to test it and clone it. 

Let us know if you need further assistance.