cheinan

Thanks for your replay

Just to make it more clear to other users
this is the working code with the plugin handles:
if ( !is_page( array( ‘slug of page using this plugin’ ) ) ){
// remove files of country-phone-field-contact-form-7 plugin
wp_dequeue_script( ‘nbcpf-intlTelInput-script’ );
wp_dequeue_script( ‘nbcpf-countryFlag-script’ );
wp_dequeue_style( ‘nbcpf-intlTelInput-style’ );
wp_dequeue_style( ‘nbcpf-countryFlag-style’ );
}

And a good article about removing unnecessary plugin files:
https://www.cozmoslabs.com/58990-remove-unused-css-js-files-in-wordpress/