Discord Mobile Gaming?

I thought about getting the Discord Mobile App and wanted to know if you can talk, even if you leave the app and, for example, open Minecraft?

Yes, you can then run it in the background

Yes, while you are using Discord on your mobile phone, you can (with a few exceptions) use all other applications.

If the call is running in the background, you will also get this displayed on the top of the mobile phone, so you will also notice if, for example, your connection was disconnected.