As part of my company distributes and funds development for mobile phone games, it's something that always provides a confict on the SSM diagrams. The only reason that side of our company still exists is how the network operators still try to retain control over what can get onto the phones and how, but that's a losing battle. For example, for the most part, you go to these B2C websites to get your games (many people still do), you still get billed by the operator, who then pays the B2C that then pays the aggregator, that then pays the developer. iTunes and Google Market are all well and good, but the games just get lost in a vast swamp, and many operators lock the phones down such that it's difficult for joe public to do.
So, in the end, most people get games that are pushed by their operator or held by the B2Cs that put those adverts everywhere for games, ringtones, tits, etc. That's how we still exist on that side, pushing the operators to keep your games at the top of the list. The network operators always want their cut, be it though data or direct sales. They get rather upset when you can download a game over the web on your PC, transfer it to the phone, and then run it. It's a model that can't last though, it's not possible, so more and more games for mobiles will be stuffed full of adverts, use micro-transactions, or you'll get a little bit of game for 99p or even for free, and then you get raped by having to pay for DLC - even per level.
Sony and Nintendo don't work like that. It shall be interesting what the network operators think of Playstation Suite when all of those publishers unleash a massive library of PS1 games. Probably just stick a massive data tariff on PSN.