Make the PMPro "Phone" Field to not be required

my_pmpro_remove_phone_field.php

<?php // do not copy this line

/**
 * This recipe removes makes the phone field to not be required at checkout
 * Note: Make sure your Gateway doesn't require these fields.
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_not_required_billing_fields( $fields ) {
	if ( is_array( $fields ) ) {
		unset( $fields['bphone'] );
	}
	return $fields;
}
//run it later in the queue if necessary if other plugins or code sets fields required, e.g. change 50 to a higher number.
add_action( 'pmpro_required_billing_fields', 'my_pmpro_not_required_billing_fields', 50, 1 );