Original Mobley Obsolete?

I've had the Netgear 815S that uses my Mobley SIM set to "4G and LTE only" since the first of the year and haven't had any connection problems even when on busy towers where speeds noticeably slowed down. My only concern with the 3G drop will be whether AT&T could use it as an opportunity to drop the Connected Car plan entirely. It does appear that AT&T is using the same Connected Car plan for the current "Harman Spark" OBDII device they used for the Mobley, so I expect our Mobley devices/SIMs will continue to work.