There's a hidden language that's part of the GSM standard that can unlock hidden features on your smartphone. You can dial ...

Android short codes: the basics Android secret short codes are numbers you dial to access hidden menus or actions on your phone.

If calls were automatically flagged as spam by your Android phone or you directly blocked them, attempts to communicate with you are automatically dropped.

If you don't own an iPhone, Pixel, or Samsung, another way you can find your SIM card's ICCID number is by using the secret short codes for Android, particularly the Man-Machine Interface (MMI) code.