The answer is simple, keep youur card inside a shielded wallet .What's on offer seems expensive though.Cheapest seems to be about £40
Quote:
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Meanwhile, contactless cardholders who are concerned about data leakage can buy a shielded wallet, which surrounds the cards with a thin sheet of metal.
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I wish I still had my metal business card wallet, it would have been perfect.However I see there are some as low as a tenner.
