IOS Hidden Code

• *#06# - Displays IMEI number
• *#21# - Check if anyone is tracking your phone
• *#30# - This displays whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call
• *#33# / *33*pin# / #33*pin# - This allows you to block or unblock outgoing calls
• *#5005*7672# - If you ever get the urge to check your carrier’s text message center number
• *3001#12345# - Get live updated information about your cell network, and see the numerical value of your signal
• *3370# - Apparently improved voice quality for GSM conversations
• #31#Phone Number - Hide your phone number to other person