With the number of people now accessing the net with their smart phones, corporate board rooms have decided it's cheaper not to create new browsers designed specifically for phones. Just tweak the stuff they already have and make it kind of work for phones. As a result, the old interfaces don't work as well for their original purpose, and phone users get to use something that was never designed for phones in the first place.
Yeah it's annoying for both computer people and phone people, but think of all the money the providers are going to make.