These shortcuts and tricks will work Symbian^3 phones like Nokia N8, C7,  C6-01 and E7 too.
Keypad shortcuts (Select “Call” from homescreen)
-  Bluetooth ON/OFF: longpress on ‘*’-key
- Call log: press call key
-  Contacts: press on contacts icon
-Open browser: longpress on ’0?-key
-  Silent profile: longpress on ‘#’-key
Keypad codes (Select “Call” from homescreen and type…)
-  *#7370# does hard reset
- *#7780# does soft reset
- *#06# shows your  IMEI
- *#0000# shows info about phone software
- *#92702689# (*#war anty#)  shows lifetimer
