The Nokia 9300 is a Nokia Series 80 Symbian Smartphone much like the Nokia 9500 with some minor changes. The 9300 was released shortly after the 9500. The 9300 is silver in colour and slightly smaller than the 9500 and therefore has a smaller keyboard which was dubbed a Thumbboard and also a smaller sized battery.
The smaller phone was probably released because the 9500 and other communicators were traditionally nicknamed "The Brick" and the size put a lot of people off from buying them. This is also the first time Nokia made a smaller Communicator since 9110.
Differences from 9500
Smaller - 132 x 51 x 21 mm compared to the 9500's 148 x 57 x 24 mm
Physically smaller screen with 9500's resolution that can be tilted full 180 degrees
No built-in camera
Smaller battery - 970mAh compared to the 9500's 1300mAh
No vibrate mode
Other than that listed above it is technically the same as the 9500, It has the same 150MHz processor, accepts MMC memory cards, same amount of memory and the resolutions and colour depth of both screens are the same. Both phones run the same Symbian OS. The 9300's successor, the Nokia 9300i, adds Wi-Fi back.