Asus ZX1 vs Siemens S55
| Type | Touch | Bar (classic) | Touch | Touch |
| Dimensions | 115.60 x 59.40 x 13.20 mm | 101.00 x 42.00 x 18.00 mm | 119.00 x 63.00 x 13.00 mm | 104.00 x 58.00 x 11.50 mm |
| Weight | 119.00 g | 85.00 g | 135.00 g | 97.50 g |
| Display size | 2.80" | - | 4.00" | 3.00" |
| Display | Color / TFT 64k colors 240 x 320 px (2.80") 143 ppi | Color / CSTN 256 colors 101 x 80 px | Color / TFT 64k colors 480 x 854 px (4.00") 245 ppi | Color / TFT 256k colors 240 x 320 px (3.00") 133 ppi |
| Display protection |   | | | |
| Additional display | | | | |
| Protection of the secondary display | | | | |
| Talk time (max.) | 2G: 300 min. (5.0 h) 3G: 200 min. (3.3 h) | 2G: 360 min. (6.0 h) | 2G: 415 min. (6.9 h) 3G: 425 min. (7.1 h) | 2G: 1020 min. (17.0 h) 3G: 370 min. (6.2 h) |
| Stand-by (max.) | 2G: 150 h. (6.3 days) 3G: 150 h. (6.3 days) | 2G: 300 h. (12.5 days) | 2G: 600 h. (25.0 days) 3G: 480 h. (20.0 days) | 2G: 850 h. (35.4 days) 3G: 540 h. (22.5 days) |
| Standard battery | Li-Ion 1150 mAhBuy powerbank
| Li-Ion 700 mAhBuy powerbank
| Li-Po 1500 mAhBuy powerbank
| Li-Ion 1200 mAhBuy powerbank
|
| Quick battery charging | | | | |
| Wireless battery charging | | | | |
| Internal memory | 256 MB | 1 MB | 1 GB | 512 MB |
| End-user memory |  | | | 160 MB |
| RAM memory | 128 MB | | 384 MB | 384 MB |
| Memory cards |  microSD | | microSD, microSDHC up to 16 GBBuy memory card | microSD, microSDHC up to 32 GBBuy memory card |
| Operating system | MS Windows CE 6.0 | - | Android 1.6 Donut | Android 2.3 Gingerbread |
| Processor | TI OMAP2431 | - | Qualcomm QSD8250 | Broadcom BCM21553 |
| Processor clock | 450 MHz | - | 1000 MHz | 832 MHz |
| GPU | - | - | Adreno 200 | - |
| Touchscreen | | | | |
| SAR (10g) | | 0,53 W/kg | 1,4 W/kg | 0,655 W/kg |
| DualSIM | | | | |
| Announced | | | 1Q 2010 | |
| Other names | - | - | Xperia X10a; Rachael | - |
| GSM frequencies | 850 900 1800 1900 | 900 1800 1900 | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 2100 | | 850 1900 2100 | 900 2100 |
| LTE standard | | | | |
| CDMA | | | | |
| Standard TD-SCDMA | | | | |
| UMA | | | | |
CAMERAS - BACK
| First camera | | | | |
| Photo matrix | 3 Mpx | nd | 8.1 Mpx | 2 Mpx |
| Resolution | 2048x1536 px | nd | 3264x2448 px | 1600x1200 px |
| Optical zoom | | nd | | |
| Digital zoom | | nd | 16x | 2x |
| Flash | | nd | LED | |
| Dual-colour LED flash | | nd | | |
| Video resolution | | nd | 800x480 px | 320x240 px |
| Video formats | | nd | MPEG4 - 30 fps | H.263, H.264, MPEG4 - 15 fps |
| Additional | - | nd | AF, EIS | - |
CAMERAS - FRONT
| First camera | | | | |
| Photo matrix | 0.3 Mpx | nd | nd | nd |
| Resolution | 640x480 px | nd | nd | nd |
| Optical zoom | | nd | nd | nd |
| Flash | | nd | nd | nd |
| Dual-colour LED flash | | nd | nd | nd |
| Additional | - | nd | nd | nd |
SENSORS
| Accelerometer | | | | |
| Proximity | | | | |
| Light | | | | |
| Magnetometer | | | | |
| Gyroscope | | | | |
| Barometer | | | | |
| Altimeter | | | | |
| Gravity | | | | |
| Hall-effect | | | | |
| Iris scanner | | | | |
| Fingerprint scanner | | | | |
| Thermometer | | | | |
| Hygrometer | | | | |
Data transfer
| xHTML | | | | |
| WAP | v2.0 | v1.2.1 | v2.0 | v2.0 |
| HSCSD | | | | |
| HSDPA | | | 7.20 Mbit/s | 7.20 Mbit/s |
| HSUPA | | | 2.00 Mbit/s | |
| HSPA | | | | |
| HSPA+ | | | | |
| LTE DL | | | | |
| LTE UP | | | | |
| WIMAX+ | | | | |
| GPRS | class 10 | class 10 | class 10 | class 12 |
| EDGE | class 10 | | class 10 | class 12 |
| Bluetooth | v2.0 EDR | | v2.1 EDR | v3.0 |
| A2DP Profile | | | | |
| HDMI | | | | |
| WiFi | v802.11 b/g | | v802.11 b/g | v802.11 b/g/n |
| WiFi frequencies | 2,4 GHz | | 2,4 GHz | 2,4 GHz |
| WiFi Direct | | | | |
| WiFi Display | | | | |
| DLNA | | | | |
| Miracast | | | | |
| WiFi hotspot | | | | |
| IrDA | | | | |
| USB | v2.0 | | v2.0 | v2.0 |
| GPS | | | | |
| A-GPS | | | | |
| GLONASS | | | | |
| Beidou | | | | |
| NFC | | | | |
COMMUNICATION AND MESSAGING
| Call waiting | | | | |
| Conferency | | | | |
| Call forwarding | | | | |
| Push To Talk | | | | |
| Instant Messenger | | | | |
| SMS | | | | |
| EMS | | | | |
| MMS | | | v1.2 | v1.2 |
| Dictionary | | T9 | T9 | T9 |
| Swype | | | | |
| e-mail client | POP3, IMAP, SMTP | | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | | | |
| RSS Reader | | | | |
Multimedia
| Radio | | | | z RDS |
| MP3 | | | | |
| Stereo speakers | | | | |
| Audio Jack | 3.5 mm | | 3.5 mm | 3.5 mm |
| HD Voice | | | | |
| Sound formats | | | AAC, AAC+, WMA, eAAC+ | AAC, AAC+, AMR, WAV, WMA, eAAC+ |
| Polyphony | | 16 voices | 72 voices | |
| Video ringtone | | | | |
| Ring composer | | | | |
| Games | | | | |
| Java | MIDP 2.0 | MIDP 1.0 | Dalvik | Dalvik |
| Videophone | | | | |
| DVB-H television | | | | |
| TV-Out | | | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | | | |
| Stopwatch | | | | |
| Alarm | | | | |
| Calculator | | | | |
| Currency converter | | | | |
| Organizer | | | | |
| Calendar | | | | |
| Flight mode | | | | |
| SyncML | | | v1.2 | v1.2 |
| Data and fax | | | | |
| Screensaver | | | | |
| Themes | | | | |
| Interchangeable covers | | | | |
| Voice dial | | | | |
| Speakerphone | | | | |
| Recorder | | | | |
| Vibrations | | | | |
