How Steve Jobs Played Hardball In iPhone Birth
"Usually, carriers catch more than a glimpse of the products their handset partners are working on. They get to provide input on what applications or features might make the device more marketable.
Not this time. Several small teams within Cingular worked on the project, but each handled its own specific task without knowing what the other teams were up to. Employees had code-names for the project to avoid mentioning Apple by name, says a person familiar with the matter."