Re: Pretty simple to resolve
They don't have to be camouflaged, just unobtrusive which is just as well as there's nothing to camouflage them as. It would be taking things a bit too far to erect a fibre-glass fake tor on Dartmoor.
If you follow the A635 eastwards from Greenfield on Streetview you will a mobile mast right beside the road near a farm which is by no means camouflaged but not really noticeable until you're beside it, even when you know it's there. Follow the road a bit further and you'll soon find there's nothing bigger than a fence post which could be used to camouflage anything for the next mile or two.
The real problem here is switching off coverage from 3G where 4G is inadequate.