How to scan for devices with Bluetooth Admin?

I need to scan for phones nearby. I want their macadresses with names or someting.

BTW. I have a second question. Can i check the mac adress of my own phone? (is mac adress changing from time to time? Or is it one mac adress for one phone?

I tried to make something like this:

@Szymon_Zachariasz Please don’t use Caps On in the title