sfx2000
3
Couple of quick tips with ATT
If the SIM card is a pre-paid SIM bought at the store, it might need to be activated - follow the instructions in the SIM kit there.
AT&T uses the “broadband” APN for data access, and make sure to select IPV4/IPV6 - there is no username/password needed, as the SIM card authenticates to the network.
Antenna’s are connected to the Main and Diversity LTE radios, the GNSS is not connected.