Hi Michele, not sure if you’ve solved this yet, so apologies if you have. If you look at the underside of the 4G shield, near the header block you should see four pads labelled ‘UART Resistors’. I believe it’s these need to be bridged.
Also, did you get an answer about what /dev/ttyXXX interface to use? I would like to know this also.
This reply was modified 1 week, 4 days ago by mikehotel. Reason: typo