I don’t know much about what you are trying to do. BUT, if you have no radio reception for your SMS different equipments will have nothing to do with that. If you have no service in that particular area stere is not a lot you can do about it. If you have some signal directional antennas will help but cable runs should be short or you will lose most of your signal in the cable.
I’ve read through your last thread, and it seems like the Arduino library and hardware have a bit of a poor SMS implementation, and there’s a chance that CAT-M1 coverage in your area could be spotty? It’s odd that it gave you 12 (excellent) then 99 (none).
If you’re looking for a completely different ecosystem, Waveshare has some SIMCOM breakouts (not u-blox SARA) that use CAT-4 LTE. The only catch is that you’d have to write up a decent amount of code to send and recieve AT commands.
Take a look:
And especially the wiki, which will give you an idea of what’s involved with getting these modules working:
I hope this gives you another route to look down, let me know if you need us to clarify anything.
I do have decent reception. I have tested the area on other (more expensive and larger) iot devices and on my phone. Unfortunately, there is just something not working for me with the Arduino board and I am looking for an alternative.