| Local Name | 6121 classic |
| Technology | GSM / HSPA |
| 3G Bands | HSDPA 900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 |
| Speed | HSPA 3.6/0.384 Mbps |
| GPRS | Class 32 |
| EDGE | Class 32, 296 / 177.6 kbits |
| Announced | 2007, June. Released 2008, February |
| Status | Discontinued |
| Dimensions | 105 x 46 x 15 mm, 66 cc (4.13 x 1.81 x 0.59 in) |
| Weight | 89 g (3.14 oz) |
| SIM | Mini-SIM |
| Display Type | TFT, 16M colors |
| Screen Size | 2.0 inches (~25.6% screen-to-body ratio) |
| Resolution | 240 x 320 pixels (~200 ppi pixel density) | Downloadable wallpapers, screensavers |
| OS | Symbian OS v9.2, S60 rel. 3.1 |
| CPU | 369 MHz ARM 11 |
| Card Slot | microSD, up to 8 GB |
| Internal Memory | 32 MB, 64 MB RAM, 128 MB ROM |
| Primary Camera | 2 MP, 1600 x 1200 pixels, LED flash |
| Video | 320p |
| Secondary Camera | VGA videocall camera |
| Alert Types | Vibration; Downloadable polyphonic, MP3, AAC ringtones |
| Loudspeaker | Yes |
| 3.5mm Jack | No |
| WLAN | No |
| Bluetooth | v2.0, A2DP |
| GPS | No |
| Radio | Stereo FM radio |
| USB | miniUSB |
| Messaging | SMS, MMS, Email, Instant Messaging |
| Browser | WAP 2.0/xHTML |
| Java | Yes, MIDP 2.0 |
| Features Summary | Push to talk, WMV/RV/MP4/3GP player, MP3/WMA/WAV/RA/AAC/M4A player, Document viewer (Word, Excel, PowerPoint, PDF), Voice memo/dial, Predictive text input, Organizer |
| Battery | Li-Ion 890 mAh battery (BL-5B) |
| Stand By | Up to 250 h (2G) / 240 h (3G) |
| Talk Time | Up to 3 h (2G) / 2 h 24 min (3G) |
| Colors | Black, Pearl White, Pink, Sand Gold |
| SAR US | 1.22 W/kg (head) 1.13 W/kg (body) |
| SAR EU | 1.18 W/kg (head) |
