I can see where your coming from. For a long time I wanted a "Playstation Phone" too. I guess, it would depend on what features it offers, the price, the plan, and if I need a new phone or not. It does actually seem like a cool idea, maybe I'll get one eventually down the road. I didn't think of this before, but if there's full PSN access, like friend invites and online play (I know the games will just be PS1 but maybe they could add something..) then I might really consider it.
Yea that is one of my big things PS Phone having the PSN access. I would rather check my XMB mail than my email. Like now it would be nice to check my PSN mail being as my PS3 is YLOD. I could still keep in contact with my friends.
To my knowledge you cannot send XMB messages from this site or any other....it is strictly PSN only.