Sony Ericsson K660i vs Sony Ericsson K850i
| Type | Bar (classic) | Bar (classic) |
| Dimensions | 104.00 x 47.00 x 15.00 mm | 103.00 x 48.50 x 18.00 mm |
| Weight | 95.00 g | 118.00 g |
| Display size | 2.00" | 2.20" |
| Display | Color / TFT 256k colors 240 x 320 px (2.00") 200 ppi | Color / TFT 256k colors 240 x 320 px (2.20") 182 ppi |
| Display protection |   | |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 540 min. (9.0 h) 3G: 270 min. (4.5 h) | 2G: 360 min. (6.0 h) 3G: 210 min. (3.5 h) |
| Video talk time (max.) |  | 90 min. (1.5 h) |
| Stand-by (max.) | 2G: 330 h. (13.8 days) 3G: 330 h. (13.8 days) | 2G: 400 h. (16.7 days) 3G: 350 h. (14.6 days) |
| Standard battery | | Li-Po 930 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 32 MB | 40 MB |
| Memory cards |  Memory Stick Micro (M2) up to 4 GBBuy memory card | Memory Stick Micro (M2), microSD |
| Operating system | - | SE A200 |
| Processor | - | ARM9 |
| Processor clock | - | 177 MHz |
| GPU | - | - |
| Touchscreen | | |
| SAR (10g) | | 1,14 W/kg |
| DualSIM | | |
| Announced | | 4Q 2007 |
| Other names | Chen | Sofia; K858c |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 2100 | 1900 2100 |
| LTE standard | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo matrix | 2 Mpx | 5 Mpx |
| Resolution | 1600x1200 px | 2592x1944 px |
| Optical zoom | | |
| Digital zoom | 4x | 16x |
| Flash | | LED, Xenon |
| Dual-colour LED flash | | |
| Video resolution | | 320x240 px |
| Video formats | | H.263, MPEG4 - 30 fps |
| Additional | - | EIS |
CAMERAS - FRONT
| First camera | | |
| Photo matrix | | 0.1 Mpx |
| Resolution | | 176x144 px |
| Optical zoom | | |
| Digital zoom | | 2x |
| Flash | | |
| Dual-colour LED flash | | |
| Additional | - | - |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | | |
| HSUPA | | |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | |
| LTE UP | | |
| WIMAX+ | | |
| GPRS | class 10 | class 10 |
| EDGE | class 10 | class 10 |
| Bluetooth | v2.0 | v2.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | | |
| WiFi frequencies | | |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 | v2.0 |
| GPS | | |
| Beidou | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | 1000 places |
| EMS | | |
| MMS | | v1.2 |
| Dictionary | T9 | T9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP, SSL, TLS |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | z RDS | z RDS |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | | |
| HD Voice | | |
| Sound formats | AAC, AAC+, M4A, RA8, WAV, WMA, eAAC+ | AAC, M4A, MP4, RA, WAV, WMA |
| Polyphony | | 72 voices |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | MIDP 2.1 3D | MIDP 2.0 3D |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | v1.2 |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |