I have installed android 8.1 default image in Nano PI M4. and I purchased Quectel EC20 module and hope call phone using this module in android.
By the way, I cannot find the phone app in android OS.
I tried to install phone app from Google store and failed because the current android OS has no default phone function.

How can I add phone app in default Android OS?
Please help me. :cry:
Thank you.