[cagey]

My favorite source for current MVNO options: https://prepaidcompare.net/

My household of 4 adults independently chooses Visible (cheapest tier, $25/mon which offers unlimited data (and and unlimited hotspot, though capped at 5Mbps)). Due to the slow hotspot speeds I might migrate DW & I to US Mobile which offers high priority high speed hotspot (up to 30GB/month at about the same price when shared across 2 lines) which could be valuable when we're traveling.

[ssl-3]

A little birdie once told me that mangling the TTL on outbound packets to 65 (either on the connected machine(s), or on a separate intermediate router) may be able to get around that particular hotspot throttle.