How much internal storage does the iPhone have? Can it be expanded? Does the iPhone have a MicroSD slot?

The original iPhone has 4, 8, or 16 GB of internal flash memory and the iPhone 3G has either 8 GB or 16 GB of internal flash memory. The memory cannot be expanded in any iPhone models.

A number of high-end phones from Motorola, Samsung, LG, Nokia and others have a MicroSD slot that makes it possible to inexpensively add more memory to the device, but the iPhone does not have this capability.

For readers not familiar with the MicroSD standard, it is a tiny flash memory card -- "about the size of a fingernail" -- designed specifically for mobile phones to hold "music, movies, video clips, pictures, ring tones and more". For more information regarding the history of the standard, please refer to PhoneScoop.

Photo Credit: Kingston.

Does the iPhone support Bluetooth?

Yes. The iPhone supports Bluetooth 2.0, as well as Wi-Fi (802.11b/g) and the Cingular EDGE network. However, the Bluetooth functionality is somewhat restricted.

Can the iPhone use iPod accessories? Can you use the iPhone with an external keyboard?

The iPhone has a standard USB-based iPod "dock connector" port on the bottom, so the majority of iPod accessories that are compatible with modern iPod models should be compatible with the iPhone as well. The Engadget blog has provided a nice run down of compatible and incompatible iPod accessories.

Although no official information is available, it could be possible either for Apple or a third-party accessory manufacturer to create a keyboard for the iPhone either using the USB-based "dock connector" port or wirelessly via Bluetooth 2.0 (although the iPhone currently does not support peripherals via Bluetooth). Of course, for a third-party manufacturer to develop a keyboard it likely would require Apple's approval and cooperation.

A simple folding keyboard -- as have been available for other handhelds for years -- could be created for the iPhone, which might be of particular interest for those who appreciate tactile feedback when typing.

Additionally, a "virtual laser keyboard" (shown at left) theoretically could be developed as well.

Photo Credit: I-Tech