How to display signal strength as a number

I came across this on Yahoo Tech. Dial *3001#12345#* and press call. This will direct you to field test, where it will now be displayed as a number. To make it permanent, restart by holding the sleep and home button until it turns off. You can switch back and forth by touching the signal.

https://www.yahoo.com/tech/how-to-di...257989351.html