LG U400
| General | Form Factor | Slider |
| Network | UMTS / GSM 900 / GSM 1800 / GSM 1900 | |
| Size | 99.8 x 48 x 20.4 mm | |
| Weight | 114 g | |
| Battery Type | Li-Ion | |
| Talk Time | 3 h | |
| Standby Time | 200 h | |
| Display | Display Type | TFT |
| Display Size | 240 x 320 pixels | |
| Display Colors | 256 | |
| External display | No | |
| Memory | Internal Memory | No |
| Card Slot | microSD | |
| Camera | Type | 2 megapixel (1600 x 1200 pixels) |
| Zoom | No | |
| Flash | No | |
| Video | Yes | |
| Secondary Camera | Yes, VGA camera | |
| Messaging | SMS | Yes |
| MMS | Yes | |
| EMS | Yes | |
| IM | No | |
| Yes | ||
| Connectivity | GPRS | Yes |
| EDGE | Yes | |
| 3G | Yes | |
| Wi-Fi | No | |
| Infrared | No | |
| Bluetooth | Yes | |
| USB | Yes | |
| Features | OS | No |
| Browser | Yes | |
| Games | Yes | |
| Other | Media player with MP3/AAC/WMA/MPEG4 support Java MIDP 2.0 Video telephony |