| Local Name | J400 |
| Technology | GSM / UMTS |
| 3G Bands | UMTS 2100 |
| 2G Bands | GSM 900 / 1800 / 1900 |
| Speed | Yes, 384 kbps |
| GPRS | Class 10 |
| EDGE | Class 10 |
| Announced | 2008, January. Released 2008, October |
| Status | Discontinued |
| Dimensions | 99 x 49.5 x 15.9 mm (3.90 x 1.95 x 0.63 in) |
| Weight | 101.2 g (3.56 oz) |
| SIM | Mini-SIM |
| Display Type | TFT, 256K colors |
| Screen Size | 2.0 inches (~25.7% screen-to-body ratio) |
| Resolution | 176 x 220 pixels (~141 ppi pixel density) | Second external, monochrome display (96 x 96 pixels) |
| Card Slot | microSD |
| Phone Book | 1000 entries, Photocall |
| Call Records | 20 dialed, 20 received, 20 missed calls |
| Internal Memory | 8 MB |
| Primary Camera | 1.3 MP, 1280 x 1024 pixels |
| Video | QCIF |
| Secondary Camera | VGA videocall camera |
| Alert Types | Vibration; Downloadable polyphonic, MP3 ringtones |
| Loudspeaker | No |
| 3.5mm Jack | No |
| WLAN | No |
| Bluetooth | v2.0 |
| GPS | No |
| Radio | No |
| USB | v2.0 |
| Messaging | SMS, EMS, MMS, Email |
| Browser | WAP 2.0/xHTML, HTML (NetFront 3.4) |
| Games | Yes |
| Java | Yes, MIDP 2.0 |
| Features Summary | MP3/AAC/AAC+/WMA player, MP4/3gp player, Organizer, Currency converter, Voice memo, Predictive text input |
| Battery | Li-Ion 820 mAh battery |
| Stand By | Up to 250 h |
| Talk Time | Up to 3 h |
| Colors | Black |
| SAR US | 0.37 W/kg (head) 0.56 W/kg (body) |
| SAR EU | 0.19 W/kg (head) |
