#Iphone check the Private browsing is enabled

gistfile1.js

try {
    localStorage.setItem('test', 'test');
} catch (err) {
    if ((err.name).toUpperCase() == 'QUOTA_EXCEEDED_ERR') {
        document.write('<div style="padding:5%;margin:5%;background:#777;color:white;height:90%">We don\'t seem to be able to store the information needed for this app to work on your phone.<br /><br />  It\'s probably because you have enabled private browsing mode. If you\'d like to disable private browsing go to settings section on your phone.</div>');
    }
}