Audio and Comms
The X400 did not include a loudspeaker or a 3.5mm audio jack, limiting audio output to the device's internal system. Users could, however, enjoy downloadable polyphonic ringtones, which were quite popular at the time. While it missed out on Bluetooth and WLAN capabilities, the inclusion of an infrared port was a significant feature, enabling direct file transfers between compatible devices. The device also boasted an FM radio, catering to music lovers and news enthusiasts alike.