Edit: The API integration worked great and then suddenly the Mojio Motion device lost service the very next day after it having service for a few years.
My layman guesstimation is that connecting to the Mojio API is what triggered Mojio/T-Mobile into suspending its IMEI from the network.
To clarify, I was not paying for the device or service-- Mojio sent me this device as a beta tester some years ago and they never asked for it back.