1. You can remove time, date, operator logo by selecting text color to 'off'.

2. You can put in new words in the T400 T9 Dictionary. Type in the new word using the normal multi-tap method. Switch immediately to T9. You can use that word in T9 after that.

3. You can also use numeric shortcuts, ie. Menu 21 to go to missed calls, Menu 55 to go to calculator, Menu 722 to go to Favourites, etc...

4. Press and hold side key to light up the external screen.

5. In T9, press '*' (star key) to toggle between upper case and lower case.

6. For silent mode, press and hold '#' (hash key).

7. When in WAP browser, press and hold '*' (star key) key to go to Menu settings option, and press and hold '#' (hash key) to bring you straight to Favourites page.

8. Program & categorise different Caller Groups.

9. You can add more than one entry in your calendar notes. Just make the entry in another date or in the to-do list, and transfer it to the desired date.

10. When keying in data in WAP, tap the blue 'i' key to toggle between upper case, lower case and numerals.

11. You can use the volume keys on the side of the phone to navigate the phone menu. The side keys also allow you to 'page up' / 'page down' while in WAP.

12. Memorize the card/phone memory number for a name and then type in '#' (hash key).  For example, if 'john' has been saved 'in card 25' then you would type... 25#.

13. When using handsfree kit, holding the button on the voice mic for a couple of seconds will redial the last number dialed on the phone.