We have been using your RPI SIM800 GSM/GPRS ADD-ON V2.0 with Raspberry Pi and it works very well and reliably. However, GSM coverage in the United States is being phased out and replaced with LTE coverage. Can you make a version of this product with an LTE compatible modem?
I am now reviewing all of the Feature Requests, this will take some time, patience please.
This is not Nextion Feature request - I will try to redirect