My Mobley is not used in the car. It is used with an adapter in the motorhome as we are fulltimers. When I first got the Mobley, it would turn off after 30 minutes. A search of internet posts alerted me to the "Power Save" menu that allowed you to change from the default "30 minutes" to "never time out." So I changed it that one time and have never had a problem since.
Over the past year mine stayed on as long as I needed it to, sometimes for hours and hours.
Yesterday when I turned it on a red light appeared on the Mobley indicating it was updating. This had never happened before. Shortly thereafter the two green lights appeared and I was connected to the internet. 30 minutes later it turned off. I toggled it back on and it stayed on for 30 minutes and then turned off.
I remembered the long-ago internet tip and signed into the Administrative area of my Mobley using my laptop. When I went to the "Power Save" options, the option to always remain on or never time out (I forget the wording) was gone. The longest time available was now showing as 2 hours.
In recent months my usage has been over 50 GB per month with one month at 79 GB.
Perhaps this change is selective for high use? I didn't really think 50 GB was high use. But, in consideration of the original intent of the Mobley to be a "Connected Car" device, 50 GB is probably way more than they expected.
So far I am happy that they haven't discontinued the device/plan completely since we are using it with a power source other than the special car port that was intended.