The Pantech U-4000 Mobile works on the networks GSM 900/1800/1900 and UMTS 2100. The mobile comes in the dimensions of 95×43x16.5 mm, weighing 92 grams.

The Pantech U-4000 Mobile has display of TFT-260K colors with the size of 176×220 pixels,measuring 1.9 inches and has channels polyphonic, MP3 customized downloadable ringtones (the default one is - ‘red red wine‘!).

The shared memory is about 30 MB and Pantech U-4000 Mobile has a decent phonebook memory with microSD and 30 MB’s shard memory.

The Pantech U-4000 Mobile has data connectivity options such as GPRS, 3G, Bluetooth and USB. and also has a camera of 1.3 MP resoluting 1280×1024 pixels with video recording.

The Pantech U-4000 Mobile is capable on standard battery of Li-ion 820 mAh.