So all in all, read the description of what the code is intended to do and perform these codes at your own risk because I will not be held responsible or accountable. To input these codes on your phone all you have to do is open up your dialer as though you’re dialing a telephone number and then enter the code.
After typing in the code the phone should pull up whatever option you’re testing.
The codes below are primarily for Smartphones running on the Android Operating System but some codes listed will also work on basic phones and Smartphones that might not be built on the Android OS such as i Phones (i OS), Windows Phones, Nokia Phones (Symbian), etc.
Some codes only work for specific manufacturers, some for specific versions of the operating system, some makes and models of phones just don’t like to work at all.
If you own a CDMA version of the i Phone, you can update your roaming capabilities by dialing a number from your phone directly, which can increase your battery life while roaming, allow your i Phone to connect to additional roaming networks and decrease the amount of blocked and dropped calls.