This phone is "rugged", apparently. So say BT, anyway, and they should know - they designed it. It's called "Elements" (because it's designed to be used in all elements, see?) and the handset will continue to work up to one kilometre away from the base station, so you can take it with you to the bottom of your (very large) garden, or when you're out walking the dog, and make sure you don't miss a call to your land line. It's also weatherproof, meaning that you can continue with your outdoor activities whatever the weather, safe in the knowledge that your trusty BT phone won't die on you. It's £59.99.
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