Siemens A51 vs Siemens A40
| Vormgeving | Bar-telefoon | Bar-telefoon |
| Afmetingen | 103.00 x 46.00 x 21.00 mm | 118.00 x 46.00 x 27.00 mm |
| Gewicht | 84.00 g | 122.00 g |
| Schermgrootte | - | - |
| Scherm | Mono / STN 101 x 64 px | Mono / LCD |
| Bescherming scherm |   | |
| Extra scherm | | |
| Secundaire bescherming scherm | | |
| Max. gesprekstijd | 2G: 300 min. (5.0 h) | 2G: 240 min. (4.0 h) |
| Max. standbytijd | 2G: 250 uur (10.4 dagen) | 2G: 150 uur (6.3 dagen) |
| Standaard batterij | Li-Ion 700 mAhBuy powerbank | Ni-MH 600 mAhBuy powerbank |
| Snel opladen van de batterij | | |
| Draadloos opladen van de batterij | | |
| Geheugen van het telefoonboek | 50 contacten |  |
| Geheugen kaarten | | |
| Touchscreen | | |
| SAR | 0,56 W/kg | |
| Dual SIM | | |
| Andere namen van deze telefoon | - | - |
| GSM standaard | 900 1800 | 900 1800 |
| UMTS standaard (3G) | | |
| LTE-standaard | | |
| CDMA standaard | | |
| TD-SCDMA-standaard | | |
| UMA standaard | | |
CAMERA'S - TERUG
CAMERA'S - VOORKANT
SENSORS
| Accelerometer | | |
| Nabijheid | | |
| Licht sensor | | |
| Magnetometer | | |
| Gyroscoop | | |
| Barometer | | |
| Altimeter | | |
| Gravity sensor | | |
| Hall-effect sensor | | |
| Iris scanner | | |
| Vingerafdrukscanner | | |
| Thermometer | | |
| Hygrometer | | |
Gegevens transmissie
| xHTML | | |
| WAP | | |
| HSCSD | | |
| HSUPA | | |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | |
| LTE UP | | |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | | |
| HDMI | | |
| WiFi | | |
| WiFi frequenties | | |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi-hotspot | | |
| IrDA | | |
| USB | | |
| Beidou | | |
| NFC | | |
COMMUNICATIE EN BERICHTEN
| Call waiting |  | |
| Video conferentie verbinding | | |
| Redirect | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Predictive text | T9 | |
| Swype | | |
| E-mailclient | | |
| QWERTY toetsenbord | | |
| RSS reader | | |
Multimedia
| Radio | | |
| MP3 bediening | | |
| Stereo speakers | | |
| Audio Jack | | |
| HD Voice | | |
| Ringtone polyfoon | | |
| Beltoon componist | | |
| Spelletjes | | |
| Java | | |
| Videoverbinding | | |
PIM EN EXTRA FUNCTIES
| Klok | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Valuta Converter | | |
| Organizer | | |
| Agenda | | |
| Vliegtuigstand | | |
| SyncML | | |
| Data en fax | | |
| Schermbeveiliging | | |
| Verwisselbare cover | | |
| Voice picking | | |
| Speaker | | |
| Memorecorder | | |
| Trilalarm | | |
