at the moment, you would have to edit the template or write your own js validation for whatever kind of validation you need for those fields
that said, if someone has no phone, he/she will just type in a fake number , i don’t think you will be able to use the validation for making sure you have a phonenumber that exists …
PS: version 3 will have a number of (infinitely extendable) validation options for those fields inbuilt. just thought i’d mention it