Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_0_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5B108 Safari/525.20)
Yes I do get that if I use www.macrumors.com in the forums on my iPhone. Try using mobile.macrumors.com and type in the forums that way to see if that helps. .
to be honest i never use MR on my iphone always MR mobile, so much better and quicker even on wi-fi, only one thing don't try and view iphone photo of the day