These are some BlackBerry secret code which can be accessed to help you know about information of your own BlackBerry.
* Changing from the style type Signal Bars to Percent Type (Numeric) do ALT + NMLL (Sure Type: ALT + NNMLL) on the home screen
* Knowing the use of data and talk time: BUYR (Sure Tyoe: BUTTER) in the [option] - [status]
* Knowing Refid and ServicesUserId: ALT + VIEW (Sure Type: VVIIEW) when opening a message
* View Event Log: ALT + LGLG on the home screen
* Aid or Help menu ALT + CAP + H (Sure Type: RACE) on the home screen
* Knowing the information about the Sim Card: MEPD (Sure Type: MEPPD) in the [option] - [Advanced Option] - [SIM Card]