I have a 9 pg form on my website that they have to fill out before I will set up an interview. If they don't fill it out they don't get an interview.

once I have received the form - they get one of two emails from me
1) thank you for being interested in my daycare. Unfortunately I don't feel that my daycare will be a good fit for your child care needs. best of luck .......
2) I would love to meet with you and your family ............

Why they might not want to do a phone interview
People can be lazy. they do so many interviews that they simply can't be bothered anymore. They could be hiding something or feel that speaking face to face will be better.
They don't like talking on the phone.

not everyone who I tell to fill out my form will do so. those who don't - while its their loss not mine.