db redirect is a free wordpress plugin to redirect your mobile users to another alternative URL.You can specify this URL in the admin panel.
To install db-redirect
Login to wordpress (wp-admin).
In your admin dashboard click plugins and select Add New.
Type db-redirect in the search field and click Search Plugins button.
Install db-redirect.
After the successfully Installation click the activate Plugin link to activate the plugin.
[OR]
Download db-redirect wordpress plugin. Download link
Unzip and upload it to your WordPress wp-content/plugins directory.
Login to wp-admin. In your admin dashboard click plugins and activate the db-redirect wordpress plugin