As you noted, in the US, 3G and older cellular modems aren't usable. For current cellular technology, the keywords to look for are LTE-M [0] and NB-IoT [1]. Mo

As you noted, in the US, 3G and older cellular modems aren't usable. For current cellular technology, the keywords to look for are LTE-M [0] and NB-IoT [1]. Most of these types of dev boards aren't cheap. Particle makes a 65 USD board [2] and they seem to have a free tier for cellular data access. [0] https://en.wikipedia.org/wiki/LTE-M https://en.wikipedia.org/wiki/LTE-M [1] https://en.wikipedia.org/wiki/Narrowband_IoT https://en.wikipedia.org/wiki/Narrowband_IoT [2] https://store.particle.io/collections/ethersim/products/boron-lte-cat-m1-noram-with-ethersim-4th-gen https://store.particle.io/collections/ethersim/products/boro...