iPhone cheat codes

*#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