Doug Rushkoff has a great piece in The Feature about about how the phone companies actually underestimate the value of communication, preferring instead to believe that users can be turned into mere consumers of pre-fab content:

As the wireless industry begins on its long, misguided descent into the world of content creation, it must come to terms with the fact that the main reason people want content is to have an excuse - or a way - to interact with someone else.

Ideally, this means giving people the tools to create their own content that they can send to friends. Still cameras is a great start. Some form of live digital video would be fun, too. ("We're at the Grand Canyon, mom, look!" or "Here's the new baby!")