*#31# - Block your number
#31# Phone-number + call - Block number for call
*#06# then press call - Get your IMEl number
*3001#12345=* - Get a more precise signal strength
*#21# - Decline calls without them knowing
*43# - Turn on/off call waiting
*646# - Check how many minutes you've use
*225# - Check the balance of your pla
*3282# - Get your cell phone plan texted to yo
*#62# - View all missed called
*3370# - Improve iPhone voice quality
*3001#12345#* - Activate Field Mode
*#5005*7672# - Check SMS number
*646# (Postpaid only) - Display your available minutes
*225# (Postpaid only) - Check your current bill's balance
*#21# - Check call forwarding status
*777# (Prepaid only) - To check the account balance
*#62# - Check # calls will be forwarded to if no service
*#76# - Check connecting line presentation
*#67# - Check the number to be used for call forwarding
*#33# - Check whether anything is barred
*#61#- Check number of missed calls
*#43# - Check call waiting status
*43# - Activate waiting
#43# - Deactivate call waiting