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I have actually. My dad does this because he was getting charged 65 a month from Vodafone for a 10GB monthly cap on 20mbps broadband until I saw his bill... they also had him on a 40 a month 5GB data plan for his mobile phone.
He'd stayed with them for 15 odd years because his niece once worked there and had him on her friends and family discount scheme.
He's not with Vodafone anymore.
However my house has walls like a nuclear bunker. I have to be outside to get a clean signal. So not sure how well I'd cope with 4G. Also I suspect they'd cap even an 'unlimited' plan with the amount of data I'd need going up and down.
I'm in this boat and want to try 4G router. Have you thought about that option?