Your iPhone has secret codes you can plug into the dialer to access hidden options. These codes “interrogate” the phone to find and change various settings. For example, you can view a more precise display of your cellular signal strength and set up call barring to block outgoing phone calls.
Many interrogation codes do things you can now do from your iPhone’s normal Settings screen. All interrogation codes are used by opening the Phone app, typing a code into its keypad, and tapping the call button. Here’s what you can do with them.
The most commonly used option here is probably Field Test Mode. Field Test Mode shows you more detailed information about your cellular signal strength, including a precise numerical value for your signal strength rather than the usual five dots. You can walk around your home or office and see where your signal is strongest and where it’s weakest, for example.
To access Field Test Mode, open the Phone app, type the following code into the keypad, and tap “Call”.
You’ll see the numbers appear in the upper left-hand corner of your screen, as shown below.
You can set up “call barring”, preventing any outgoing calls until you disable the call barring feature. This feature is not available in your iPhone’s Settings screen, so you have to use these hidden codes to enable it.
You don’t need to set a SIM card PIN to use this feature. However, if you have enabled a SIM card PIN at Phone > SIM PIN, you’ll need to know it. This is different from your screen unlock PIN.
To enable car barring and prevent outgoing calls, plug the following code into the dialer and tap “Call”. Replace “PIN” with the numerical PIN of your SIM card. If you don’t have a SIM card PIN, you can type any number you want in place of the PIN. The number you choose doesn’t matter.
To disable car barring and allow outgoing calls, plug the following code into the dialer and tap “Call”. Replace “PIN” with your SIM card PIN, if you’ve set one. If you haven’t, you can type any number you want.
The dialer will accept any value if you haven’t set a PIN, so you could type *33*0# to enable call barring and then type #33*1# to disable it.Read More...
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