upgrade.php

<?php
	if( is_admin() ) {
	
		$installer_wpsms_ver = get_option('wp_sms_db_version');
		
		if( $installer_wpsms_ver < WP_SMS_VERSION ) {
		
			global $wp_statistics_db_version, $table_prefix;
			
			$create_sms_subscribes = ("CREATE TABLE {$table_prefix}sms_subscribes(
				ID int(10) NOT NULL auto_increment,
				date DATETIME,
				name VARCHAR(20),
				mobile VARCHAR(20) NOT NULL,
				status tinyint(1),
				activate_key INT(11),
				group_ID int(5),
				PRIMARY KEY(ID)) CHARSET=utf8
			");
			
			$create_sms_subscribes_group = ("CREATE TABLE {$table_prefix}sms_subscribes_group(
				ID int(10) NOT NULL auto_increment,
				name VARCHAR(20),
				PRIMARY KEY(ID)) CHARSET=utf8
			");
			
			$create_sms_send = ("CREATE TABLE {$table_prefix}sms_send(
				ID int(10) NOT NULL auto_increment,
				date DATETIME,
				sender VARCHAR(20) NOT NULL,
				message TEXT NOT NULL,
				recipient TEXT NOT NULL,
				PRIMARY KEY(ID)) CHARSET=utf8
			");

			require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
			dbDelta($create_sms_subscribes);
			dbDelta($create_sms_subscribes_group);
			dbDelta($create_sms_send);
			
			update_option('wp_sms_db_version', WP_SMS_VERSION);
		}
	}
?>