Using an app on the phone will allow you to track your food and exercise, along with your weight and water intake. If you use the mobile site on your phone's browser, you can do those things along with spinning the log-in wheel. The url for the mobile site is here: mobile.sparkpeople.com/
On some phones, you may be able to do some of the other things on the site on the regular site url, but it may take you a while because you may have to scroll more.
Hope that helps!