4G Router with Sim Card Slot (Nr Upper Stratton, SN6)

Being requested as we'd like to trial one of these in the next couple of days to test whether the signal in our location on the outskirts of Swindon is adequate to operate an economical off-grid (not fibre) & non contract, workable broadband connection that meets our needs due to the ending of our (copper wire) ISP contract. Thank you