A PDA phone, as a converged device, is a PDA and cell phone combination, for example the RIM BlackBerry and Samsung SCH-i730. Different research houses provide varied definitions to a PDA phone; from data-centric mobile terminal with rich PDA functionality, to devices with Palm operating system or Pocket PC phone edition (for example the O2 XDA Flame. PDA phones predominantly have data capabilities, multiple data input methods (for example stylus, touch screen, extended keypad), wireless email functions, security and device management features, organizer functions, usb connection, charging from PC and extensive third party application support. A smartphone on the other hand, is mainly a phone with some PDA phone features like organizer function, data viewing capabilities without editing functions.
They are also called smartphones, but this can be misunderstood as the Windows Mobile Smartphone platform, which does not use a touchscreen. The term "smartphone" (with a lowercase "s") refers to any PDA phone, regardless of the presence of a touchscreen or operating system. However, this may be resolved as with the Windows Mobile 6 release, the Smartphone platform will be rebranded "Standard" so this may clear up the confusion.
