Is iPhone ready for your company? At least three firms we spoke with — including Kraft Foods and Oracle — think it is. We share their insights here and pull out their early lessons to help you build the case for supporting iPhone in your enterprise. The big iPhone lessons are: It's more than just another device; it drives business culture change; it gives employees freedom to choose their own tools; and it changes the support model to self-service. But the real payoff of iPhone and similar mobile Internet devices is that it is a new platform for delivering content and collaboration applications to an increasingly mobile workforce.