The site you mention doesn’t change the user agent.
Here is a quick solution:
1. navigate to http://www.botsvsbrowsers.com/SimulateUserAgent.asp
2. Enter this string into the user agent field:
Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543 Safari/419.3
This will only work for a quick preview. A better method is to install “User Agent Switcher” extension for Firefox.
