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I use this on my site to show a different single.php. I have a folder mobile in my theme folder with my mobile templates. I copied single.php, removed the get_sidebar and then added css when on mobile to style it better. This code works in functions.php.

`function mobile_filter_wp_template( $template ) {

$overridden_template =  dirname( __FILE__ ) . ‘/mobile/mobile-single.php’ ;

if ( is_single() && wp_is_mobile() ) {

return load_template( $overridden_template );

} else {

return $template;

}

}

add_filter( ‘template_include’, ‘mobile_filter_wp_template’, 10, 2 );`

`function mobile_style() {

if ( is_single() && wp_is_mobile() ) {

echo ”

<style>

body {

width: 100%;

}

</style>”;

}

}

add_action(‘wp_head’, ‘mobile_style’);`

Use WP is_page to set conditions to specific pages https://codex.wordpress.org/Function_Reference/is_page