LTE modem failover hardware that doesn't need a subscription

Hi all,

What are your recommendations for LTE modem failover hardware, preferably something that can take a SIM from whatever provider, and can just sit there.

I currently have a Cradlepoint ARC CBA850, and it won't get firmware updates anymore because those are locked behind a paywall. :(

So I am looking for something with similar functionality and reliability, that doesn't need a subscription to update it.