How can I modify this code to use phone number instead of email?

Hello, I have developed this code but I am not sure how to change it without losing functionality. I am trying to make it so that instead of email, it uses phone number. Any help would be appreciated.

This is the code:

{% unless product.available %}

{% form 'contact' %} {% if form.posted_successfully? %}

Te notificaremos cuando este producto este disponible.

{% else %}

Click aqui para ser notificado cuando {{ product.title }} este disponible.

{% endif %} {% if form.errors %}

Por favor da una direccion de correo electronico valida.

{% endif %} {% unless form.posted_successfully? %}
{% if customer %} {% else %} {% endif %}
{% endunless %} {% endform %}

{% endunless %}

This type of form requires e-mail input.

https://shopify.dev/docs/themes/customer-engagement/add-contact-form#required-input

Potentially you can add phone number input and add some dummy e-mail input value as a workaround if you want to hide the e0mail input.

thanks for the feedback