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.
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by Chris Hoffman via How-To Geek
Everything You Can Do With Your iPhone’s Secret “Interrogation Codes”
![Everything You Can Do With Your iPhone’s Secret “Interrogation Codes”]()
Reviewed by Ossama Hashim
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May 06, 2017
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