My new cellular phone is Sony ericsson w910i, these phones are a little different from Nokia phones so i'll be giving you some tips about how to start using the phone :

-To add a space between words u will use the (#) button instead of zero in Nokia phones.

-To switch to silent mood press the (#) buton for a few seconds.

-The bluetooth headset is usefull as the speakers are a little lower in sound. There's no proved method to increase the sound/voice in this phone, so if you increased the sound to the maximum and you still not satisfied, the bluetooth headset is your solution.

-The Sense me function is used in games, u just move your phone don't use the keys (up, down, right left)! but u can change the options.

-To mark several items in a list (messagesm for example) just choose options then Mark several.

-Use the key on the upper right side to increase or decrease the volume. If you are receiving a call you can make the phone silent by pushing this button once, pushing it twice will send a busy tone to the caller.

-Horizontal or vertical! u can view images and play music as u want just hold your phone horizontally or vertically and the picture will change it's direction to fit the new position.

-To change the writing language just press the (#) button for a few seconds (while writing a text message).

-To charge the bluetooth handsfree, use the phone charger, notice the small metal pins on the side plugged into the phone, one of them is a little longer, plug the headset in it. Like in this pic :

-Shake control : press on the Walkman® key, then flick your wrist. A vibration lets you know that the track has been changed - a new song from your current playlist is selected randomly then played automatically. Shake your wrist to the other side to go back to another song.

How to install themes for Sony Ericsson w910i:
After downloading the theme, unzip/unpack the files. Connect ur phone to the PC and copy the files into the themes folder.Then go to the main menu in the phone (after disconnecting it) , choose Settings > Display > Themes and choose ur theme. :)

-Get yourself some beautiful themes for your phone from these sites :
Themes for Sony Ericsson