Hi,
I'd say pick a provider e.g. orange, t-mobile, vodafone, three, o2 then put a few postcodes of where you are likely to be using mobile Broadband, into their coverage checkers online to see what signal you should get.
I wouldnt imagine 3G is too good anywhere in Caithness.
My girlfriend signed up for t-mobile in Exmouth, Devon and it was un-usable and we had to request a refund and cancel the contract as the signal was too poor even though when we signed up online it said she could get a "good" signal using the postcode of her flat.
I'd say its hit and miss really.
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