My two cents
This is probably the first DMR capable radio that is made for amateur radio. Obviosly not per default, but thanks to OpenGD77 it is now suited for amateur radio usage.
Original boot tone melody
Open Extras –> Download callsign database and fetch the data that you want.
Set the region to the desired MCC that you want to import. You can also use the inactivity filter that fetches only recently active DMR-IDs. Or you can import DMR-IDs from a file.
I usually import them from a CSV-file. The file that I use contains all the austrian callsigns plus a few other callsigns, that I regularly see. So I need to import about 2000 callsigns.
If you don’t have a proper file to start with use this one here. It contains
232, 262, 263, 264, 222, 228. Download (~160KB; 2020-11-16)
Or: download your own set of DMR-IDs with the regions you want. You can also
download only some federal states (like
2327,2328) if you don’t want all
232. Read along here for some instructions about this.