How to access APN settings:
Settings->Tethering&Networks->Mobile Networks->Access point names (APNs)
There is only 1 APN
ATT Nextgenphone
nxtgenphone
Here are the settings:
Name: ATT Next genphone
APN: nxtgenphone
Proxy: Not set
Port: Not set
Username: Not set
Password: Not set
MMSC: http://mmsc.mobile.att.net/
MMS proxy: proxy.mobile.att.net
MMS Port: 80
MCC: 310
MNC: 410
Authentication type: none
APN type: default,mms,supl,hipro,fota
Sidenote: after installing CyanideL a Cyanogenmod 12.1 ROM my APNs were changed but still work.
I’ve had the LG G3 for a few months now and at one point I looked in the mobile data file and there was no APN. Now I looked through it and this ATT Nextgenphone is on there. Does it update and download that automatically?