I was ABOUT to post this! Darn! You beat me :P. But yeah, this method works like a charm! Jailbreak your phone, get SBSettings from Cydia/Icy, then get UserAgent Faker (UA Faker), enable it by going into the SBSettings (swiping finger on top of screen and ticking on).
Yeh.
This is why you don't buy apple products. I'm not gonna bash them as I used to religiously buy their products. I thought that the iPhone was capable of at least the user agent switching, like the android is capable of. I can freely switch by switching from android to desktop, and only a reload of the web page is necessary. I can even run it in iPhone mode, don'tcha know. I request it not to be removed, because for some of us that are constantly on the go, we are often in areas with patchy 3G coverage. Without 3g, it's near impossible to load full web pages with ease.
Well, I think a general consensus would be to have an option to switch it on or off, like youtube does.