We all now have a phone in our pockets. It might be a smartphone or a simple cellular phone with basic functions.
While we are familiar with the general settings available inside the phone box, there are many more functions available if you press certain key combinations.
There are thousands of these codes: some work with a specific brand or model, some only for basic or smartphones and the rest are universal.
iPhone or iOS Codes:
#1 This code hides your number in all outgoing calls.
#2 Shows IMEI number.
#3 Turns on/off the number identification.