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

All iPhone models use internal flash memory that cannot be expanded. The original iPhone has 4, 8, or 16 GB, the iPhone 3G has 8 GB or 16 GB, and the iPhone 3GS has 16 GB or 32 GB.

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 models do 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, All iPhone models support Bluetooth although the functionality is somewhat restricted. Version 3.0 of the iPhone OS added substantially improved Bluetooth support including "peer to peer connectivity", support for accessories, and Internet tethering as well (In the US, AT&T Wireless does not yet offer Internet tethering as of the date last updated).

Can the iPhone use iPod accessories?

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.