Bit of a tangent but a handy thing I found: if you're with Vodafone mobile and broadband, if the broadband ever dies for a week or whatever (which let's face it they all eventually do), Vodafone mobile just crank your 4g up to 100gig or so until it's fixed, and you use that as a router.
I mean: not ideal, but fair enough to them, it's better than BT managed.