Admin Users panel add custom column and include in search

add_filter( 'manage_users_columns', function( $column ) {

	$column['billing_phone'] = 'Phone number';

	return $column;

} );

add_filter( 'manage_users_custom_column', function( $val, $column_name, $user_id ) {

	switch( $column_name ) {
		case 'billing_phone':
			return get_user_meta( $user_id, 'billing_phone', true );
		default:
	}

	return $val;

}, 10, 3 );

add_action( 'pre_user_query', function( $query ) {

	// Users Page Only
	global $pagenow;
	if( $pagenow != 'users.php' ) {
		return;
	}

	// Search Only
	if( empty( $query->query_vars['search'] ) ) {
		return;
	}

	// Left Join Usermeta
	global $wpdb;
	$query->query_from .= sprintf(
		"
			LEFT JOIN %s umeta_phone
			ON umeta_phone.user_id = %s.ID
			AND umeta_phone.meta_key = 'billing_phone'
		",
		$wpdb->usermeta, $wpdb->users
	);

} );

// Add Usermeta To Search Columns
add_filter( 'user_search_columns', function( $search_columns, $search, $query ) {

	$search_columns[] = 'umeta_phone.meta_value';

	return $search_columns;

}, 10, 3 );