mms phones send photos as emails. You could write a script in PHP, C#, ruby, ..., [insert language of your choice] to get the email from a POP3 server --- or pipe it directly to a processor of your choice; see
http://www.evolt.org/article/Incomin..._PHP/18/27914/ then save attached images. Hook this up to an existing gallery like coppermine or code something yourself and you're in business.
I investigated doing this during christmas but couldn't think of a unique selling point for it.. there are lots around already. I'd be looking for around ?80 (~$150 I think) for integrating something like the above into an existing gallery script but I have no time to do it. If you have time, why don't you give it a bash? There is no 'advanced' code involved and you'll save money