title: Custom phone validation in WooCommerce
body: <p>I would like to add custom validation to the phone number (billing_phone) on:</p>
  <ul>
  <li>Checkout page</li>
  <li>Register page</li>
  <li>My account page</li>
  </ul>
  <hr />
  <ul>
  <li>With 05</li>
  <li>Accept 10 numbers</li>
  </ul>
  <p>I'm using <a href="https://stackoverflow.com/a/47873570/11987538">Validate phone number in woocommerce checkout page</a> answer code, but it only works for the checkout page.</p>