Problem is that I don’t have a smart phone or even an iPhone (well, gota wait for a break from Tmobile) and to test those applications you need one. After some research I found out that you can add any user agent that you want on Firefox User Agent plugin.
Today I have tested this little feature and it is outstanding how it works.
Ok, so this is what you need:
1. Install Firefox User Agent
2. Follow the steps on this little article (click here) to add a iPhone to user agent to your Firefox
3. Go to any site prepared to a seen to any smart phone with the default agent and then, enter again with the iPhone agent set and notice the difference (like http://m.goal.com/)