The following codes allow you to access call management features of your phone and set up such features as call forwarding and call waiting. There are also specific codes that you can enter to get your billing info displayed or sent to you as an SMS.
*#67#: A secret code to check call forwarding on your phone. This will tell you whether your calls are being forwarded when your line’s busy and which number they’re forwarded to.
*#61#: This code shows you how long it takes until your phone calls are forwarded to the message center.
#31#: A code that disables your caller ID.
*31#: This code reinstates your caller ID.
*43#: Use this code to activate call waiting.
#43#: A code to deactivate call waiting.
*5005*7672#: A USSD code for learning your SMS message center number.
*3282#: Use this code to get an SMS message with your billing info.