Get a Metro PCS phone, root the thing (watch it done on youtube etc. if you don't know how), and download pda.net or smart hotspot etc. The apps allow you to hide the data usage by stripping user info from the packets. 65 bucks a month for unlimited data (5g? for hotspot), runs generally at 3-9 down 1up, no contract.
NFC about national coverage but never had issues from Tahoe to San Francisco daily.
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