I use a cell phone as a hotspot.. Technically it is only good for one device but my wifi repeater runs to a router and it serves many devices. Its a verizon plan for rural areas that is crappy in town but works great for our needs.
I had a similar set up earlier this year where I was using an OTG cable from a phone to a router.
Trust me when I say switching to a cellular modem was the best decision I made. Just restore the imei... add a vpn... and enjoy unthrottled internet.
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