In reply to Ridge:
We've just moved somewhere rural with only poor cable Internet and need to work from home. The landlord recommended a small enterprise called NotSpot that had already installed aerials, their router was in situ and we would have to buy a locked and rebranded EE sim to use it at something like £55/mo. Bit steep, but path of least resistance and we had other faff with the move so decided we would plumb for it.
Customer service was initially great, got their sim delivered pronto but their "engineer"/director repeatedly failed to actually set us up and missed agreed dates and times for phonecalls. I let him know I was peed off and considering alternatives and the response came back full of technobabble and threats that I'd be wasting time and money if I thought I could do it myself.
Given we could hotspot off our phones fine, we thought we possibly didn't really need an aerial extender. Bought a good spec Huawei 4G router second hand from CEX for about £100, used a giffgaff sim as interim/proof of concept (only supposed to use for phones and "unlimited" caps at 80GB) then signed up for a proper mobile broadband O2 (best signal in area) SIM in store. Guy in store explained we would be better on a contract for a dinky battery powered mobile hotspot (also huawei), unlimited (600GB/mo) data about £35/month, but can pay off the £30ish device immediately to escape the 24mo contract to be on rolling monthly. Further 20% discount through work. We will be saving money compared to NotSpot after a few months, own the main router ready for our next place, and got the little router as well now for use in the van.
We've had no problems whatsoever in 2mo and I'd reccommend the DIY route since you have already proved decent signal strength through hotspot. The niche for these little rural broaband companies seems to be if you're really in the sticks with crap signal and need more than a simple extender.
Just make sure the contract is a "mobile broadband" one, not just a SIM intended for phones or you might be violating TOS and get download/speed throttled.
Post edited at 12:37