| Siemens A55 | HTC Desire Z |
| Manufacture | Siemens | HTC |
| Model | A55 | Desire Z |
| Form factor | Block | QWERTY Slider |
| Weight | 84 gram | 180.00 |
| Dimensions (HxWxD) | 101 x 44 x 21 | 119.00 x 60.00 x 14.00 |
| Operating System | Other | Android |
| Networks | 2G - 900/1800 | 2G - 850/900/1800/1900 3G - 900/2100 |
| HSCSD |  | |
| GPRS | |  |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | | |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | NA | NA |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | NA | 5 megapixel, autofocus, face detection, geo-tagging |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | NA | NA |
| Second Camera | NA | NA |
| Display size | 0 inches | 3.70 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | NA | 16000000 |
| Display width | 101 | 480 |
| Display height | 64 | 800 |
| PPI | NA | 252.15 |
| Second Display | NA | NA |
| CPU | NA | 800 MHz |
| GPU | NA | NA |
| Memory | NA | 512 MB. 1.5 GB storage. Expandable with microSD card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | Polyphonic | MP3, AAC, AMR, OGG, M4A, WAV, WMA |
| Java | | |
| Games | NA | Yes |
| FM Radio | | |
| Battery | Li-Ion 700 mAh | 1300 mAh |
| Standby time (h) | 250 | 430 |
| Talktime (m) | 300 | 590 |
| Wireless Charging | | |
| Browser | 1.2.1 | Android HTML Webkit |
| Calendar | NA | |
| Voicedialing | NA | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |