function isMobile(){

    if (typeof this._isMobile === 'boolean'){

        return this._isMobile;

    }

    var screenWidth = this.getScreenWidth();

    var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport ||rendererModel.runningExperiments.fixviewport;

    var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");

    if(!fixViewPortsExperiment){

        if(!this.isAppleMobileDevice()){

            screenWidth = screenWidth/window.devicePixelRatio;

        }

    }

    var isMobileScreenSize = screenWidth < 600;

    var isMobileUserAgent = false;

    this._isMobile = isMobileScreenSize && this.isTouchScreen();

    return this._isMobile;