Good morning, I have three Starling 2 Max's with your VOXL Cellular LTE and USB hub add-on. I am struggling to find a sim card / data provider that is reliable. While I could connect with a sim card from Hologram, their network prioritization was not ideal and dropped too often for reliable MAVLINK based control. I have sense tried Mint, and AT&T data cards which never would connect. I am hoping to skip the guess work and inquire to if you have a list of known good sim card providers and plans.
For Mint Mobile, I have tried "wholesale" and a few others for the APN. Can you pass what configuration you used?