function isMobile() {
    let isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);

    // Screen resolution method
    if (!isMobile) {
        let screenWidth = window.screen.width;
        let screenHeight = window.screen.height;
        isMobile = (screenWidth < 768 || screenHeight < 768);
    }

    // Touch events method
    if (!isMobile) {
        isMobile = (('ontouchstart' in window) || (navigator.maxTouchPoints > 0) || (navigator.msMaxTouchPoints > 0));
    }

    setCookie_all('isMobile', isMobile);

    return isMobile
}