By this plugin you can override default Joomla template with another one, when your website is browsed by mobile devices. Select the template to override the default one, and the plugin will does the switch of the template.
Digi Template Switch can override the default joomla template with another one, only for mobile browsing.
If you need more functions, to have a dedicated template for smartphones and another dedicated template for tablets, to switch the template depending of operating system and much more, take a look to the pro version of this plugin: Digi Template Switch Pro
This plugin is so easy to use: just install and publish it, then select which template you want to use on mobile devices, save, and youre ready.
No, since the 1.3.0 version this plugin works just on frontend, so you can login to your admin with the default admin template also from mobile devices.
No, the template swich is triggered by the device used to browse the site.
Please remember that often templates have different module positions and the names are not the same. So if you have a menu published in the main template in a position called "main-menu" you should duplicate the module and publish the copy in the right module position of selected mobile template, because maybe it doesn't have the module position called "main-menu".