numbers instead of email

Hi,
I have a WordPress website with woocommerce. I’ve installed the “WooCommerce Waitlist” plugin to collect customer information (when a product is out of stock customer enters his email). Everything is great up to now.

But I need that customers enter their cell-phone numbers instead of their emails. When a customer enters his cellphone number in the email field a message shows up and says “enter the value-form of email”.

My question: I need the “Email field” accept cellphone number instead of email.

-To see what I’m doing this is a link that I’m working on that: https://atlantic7.ir/skletenblack/

-The Woocommerce Waitlist plugin official link: https://woocommerce.com/products/woocommerce-waitlist/

Thank you
Sincerely