[jrexilius]

One issue to note is carrier. ATT is now blocking devices that are not on their "approved" list. You may need to go with an alt carrier like Hologram or TMobile: https://www.hologram.io/products/iot-sim-card

[manatana]

Why not use Lora, NB-IoT or LTE-M?

https://hackaday.com/2022/05/25/long-distance-text-communica...