Changes
Some features, available in the original system, such as MP3 playback, FM radio reception and USB connectivity were removed from the new device, presumably to reduce size and cost. Instead of using the N-Gage with generic USB removable drive drivers, a user could use either Bluetooth or a separate MMC card reader to transfer files onto the device memory or an MMC card for use in the N-Gage QD. The QD did not support MP3 internally; however, it could still play MP3s with third-party software, albeit only in 16 kHz mono.
Another change from the original unit was the "Orange-and-grey" theme of the face of the unit as well as the GUI. Some felt this was an unwanted change from the 'more colorful' GUI of the original N-Gage. Even then there were some third-party applications that enhanced the interface or replaced the system shell.
As a telephony device, the newer N-Gage no longer supported three GSM frequency bands 900/1800/1900; instead it came in two dual-band variants, one for the American market and another for the European and Asian markets.
The only change made to the device's buttons was the replacement of the original five-way controller (four ordinal directions and a center "click" or confirm) with a simpler four-way directional controller and a separate "OK" button with a check logo.
Read more about this topic: N-Gage QD