There is something very easy and works great! It’s called UAFaker, and it lives in SBSettings. This is the first, main, but not the only reason I jailbroke my iPhone. It tells servers that instead of an iPhone, you’re using FireFox. UAFaker won’t give you Flash clips, and for some reason my.yahoo.com page won’t load if UAFaker is running (it loads once UAFaker is toggled off in SBSettings).
I installed UAfaker and enabled it using SBSettings and I still only got mobile sites (ESPN, DallasCowboys.com, MSN) is there another app to do this that works with 3GS?