Hidden Codes for iPhone

Here is a list of some secret USSD codes for iPhone that are designed to allow technicians and specialists to delve into some hidden settings in your phone software.  Warning, use these codes at your own risk.  

*3001#12345#* Activate Field Mode, which contains all of your iPhone’s more technical settings. It also converts the signal bars into an actual number.
*#5005*7672# Check SMS center
*646# (Postpaid only) Display your available minutes
*225# (Postpaid only) Check your current bill’s balance
*#31# Choose whether to hide your number
*3370# Enable or disable EFR (Enhanced Full Rate), which improves your iPhone’s voice quality, but will quite likely reduce battery life
*#21# Check call forwarding status
*777# (Prepaid only) To check the account balance
*#62# Check which number calls will be forwarded to if no service is available
*#76# Check connecting line presentation
*#67# Check the number to be used for call forwarding
 *#33#   Check whether anything is barred, such as international calling 
 *#61#   Check number of missed calls
 *#06#   Displays your iPhone’s IMEI number
 *#43#   Check call waiting status
 *43#   Activate waiting
 #43#   Deactivate call waiting

 

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