What does *# 0 *# do?
Accessing the Secret Diagnostic Menu




To get the ball rolling, simply open your Samsung's phone app. From there, enter *#0*# using the dial pad, and the phone will immediately go into its secret diagnostic mode. Note that the process is automatic, so there's no need to tap on the green call button to enter the command.

What does ## 002 mean?
##002# - If your voice call or data call, or SMS call has been forwarded, dialling this USSD code will erase them. *#21# - By dialling this USSD code, you would get to know if your calls have been diverted somewhere else or not.

8 hidden Android features you should be using
Guest Mode. Does someone need to use your phone? ...
Snooze notifications. ...
Show emergency info. ...
Adjusting the Quick Settings panel. ...
Focus Mode. ...
Fast app-switching. ...
App shortcuts. ...
Wake your phone with your voice.