Three Issues
1)  Is the A80 Pro compatible with AT&T networks in 4G?
2)  If so, I'm only connecting enough to phone and WiFi.  No wireless data.
     Further issues occurred when I looked at the APN and WiFi calling settings.  I was greeted by the com.android.phone has stopped error message.
     Turning off phone services permitted me access to the APN settings.
     I did my research on the error and did the basic things advised (cleaned caches, rebooted/restarted the phone, turned off Google Play auto-update).
     The problem feels like android issue (clashing between settings program and "phone services")...and idea of how to fix that?
3)  I tried and failed to use the included app "SIM Toolkit" (I'm told that "SIM Toolkit is not ready or unsupported").  Any fix for that?

rkowicki wrote:

Three Issues
1)  Is the A80 Pro compatible with AT&T networks in 4G?
2)  If so, I'm only connecting enough to phone and WiFi.  No wireless data.
     Further issues occurred when I looked at the APN and WiFi calling settings.  I was greeted by the com.android.phone has stopped error message.
     Turning off phone services permitted me access to the APN settings.
     I did my research on the error and did the basic things advised (cleaned caches, rebooted/restarted the phone, turned off Google Play auto-update).
     The problem feels like android issue (clashing between settings program and "phone services")...and idea of how to fix that?
3)  I tried and failed to use the included app "SIM Toolkit" (I'm told that "SIM Toolkit is not ready or unsupported").  Any fix for that?

Hello, sorry to make this inconvenience. You've better to contact our professional after-sale department: support02@blackview.hk