In a nutshell, the change-log would read: (1) Windows Mobile 6.5 support, (2) Fullscreen text viewing and (3) Word count.
About the phone
If you are looking for technical specifications of the phone, check out Sony Ericsson website http://www.sonyericsson.com/spg.jsp?cc=global&lc=en&ver=4001&template=pp1_1_1&zone=pp&lm=pp1&pid=10527.
In short, the phone is of a clamshell design with smooth glassy mirror-like surface. It has Bluetooth with A2DP stereo, GPRS, 3G, POP3 Email, MMS, Video call, etc. It also has dual camera with the main camera being 2 mega-pixel. There is an outer OLED display that is surprisingly visible only when it is active.
Overall Phone Features: (as on Nokia Website and GSMArena)
- Mobile music player for MP3 and AAC files
- Stereo FM radio
- Digital recorder from integrated FM radio and Audio Line-In
- Music files as ringing tones
- Music storage on multimedia card
- Multimedia messaging & GPRS web access
- Java™ games
- For GSM 900/1800 networks
- Xpress-on™ covers
Note: There are two variants of this phone, one released in America (with Qwerty keyboard and Bluetooth) and another for European and Asian market (without Qwerty keyboard and Bluetooth.) All the details here are with respect to the latter (Eurasian) model.