I have "business class" service from a provider (Canada - Rogers), which came with a "Clearnet" router/wifi combo that has, LTE failover. (Cradlepoint)

And - of course it was locked for admin - well - not for long, the technican who installed it gave me the password after we chatted for awhile. Admitedly, I cannot change the PW he gave me, and at some point if they remotely update it, it will stop working.