Well, there are mobile games that Aeria publishes. But, I don't think that there will be a phone that can fully support an MMO for a long time.
That is totally BS haha
I found a way around this with an iOS app called Splashtop2 (Remote version) which enables me to play GF in full graphics, sound etc via my iPhone 5 and iPad's it's not one bit laggy when I'm at home using it across my home network nor is it too laggy using it from work etc.
The UI can be a pain at first but if you're willing to drop a few dollars then you can download and personalize your gaming controls etc otherwise you can still use your tab bar, move around, left and right click etc as normal on the free version except I think that only works when your computer or laptop and iOS device are using the same network.
There are other ways Aeria could enable user abilities to tablet and Smart/iPhone users however I highly, highly doubt Aeria would ever consider the options available for that as they would need ALOT of developer work to be able to fully monetize and create a subscription based way of people accessing their "F2P" games via tablets and smart/iphones.
Splashtop has also enabled me to play GW2, DotA and Diablo2 via my iOS devices easily they also claim to allow usability to many other games like WoW, LOTRO and the list goes on which I'm yet to try...