What to do when you run into that ?
Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543a Safari/419.3
You will then be able to see that:
… which in that case we will all agree does not help much :-)
Additional interesting link regarding User-Agent: whatsmyuseragent.com