Siemens A51 specifications
| Dimensions | 103 x 46 x 21 mm |
| Volume | 75 cc |
| Weight | 84 grams |
| Stand-by | 1.5 week |
| Talk time | 5 hour |
| Announced | January 2005 |
| Status | No longer available |
|
| Monoblock | |
|
| Directional key | |
|
| Monochrome display | Orange backlighting |
| 101 x 64 pixels, 4 lines |
|
| Integrated antenna | |
| User exchangeable covers | |
|
| Vibrating alert | |
|
| Dual band | |
| Personal Information Management (PIM) |
| Alarm clock | |
| Calculator | |
| Date and time notation | |
| Phonebook with groups | |
|
| Automatic switch on/off phone | |
| Games | |
|
| Predictive Text Input | T9 |
| SMS | Group messaging, Receive and send concatenated messages |
|
| Polyphonic ringtones | 16-tone polyphonic ringtones |
|
| Internal memory | |
| 120 KB |
|
| Battery | User replaceable |
