capabilities: {
    'browserName': 'chrome',
    'chromeOptions': {
        args: ['--user-agent ="Mozilla/5.0 (iPhone; U; CPU iPhone OS 5_1_1 like Mac OS X; en) AppleWebKit/534.46.0 (KHTML, like Gecko) CriOS/19.0.1084.60 Mobile/9B206 Safari/7534.48.3"']
    }
},

browser.manage().window().setSize(1136, 640);

capabilities: {
    'browserName': 'chrome',
    'chromeOptions': {
        'args': ['user-agent=Mozilla/5.0 (iPhone; CPU iPhone OS 8_0_2 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12A405 Safari/600.1.4']
    }
},