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https://stackoverflow.com/questions/56275172/how-to-detect-device-in-smarty-in-prestashop-1-7-in-a-tpl-file

{if Context::getContext()->isMobile() == 1}
    {if Context::getContext()->getDevice() != 2}
        // TABLETTE
    {else}
        // MOBILE
    {/if}
{else}
    // PC
{/if}