Every time a new card is stored, Nokia process a low value (1GBP) authorization to verify that  the card details are correct. However, it is just an authorization and not an actual charge. In some cases, this activity may appear on your bill or statement but you are never actually charged the money.

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Nokia Lumia Icon,Nokia Lumia 2520,Nokia Lumia 1520,Nokia Lumia 1320,Nokia Lumia 1020,Nokia Lumia 928,Nokia Lumia 925,Nokia Lumia 920,Nokia Lumia 830,Nokia Lumia 822,Nokia Lumia 820,Nokia Lumia 810,Nokia Lumia 735,Nokia Lumia 635,Nokia Lumia 630,Nokia Lumia 620,Nokia Lumia 530,Nokia Lumia 521,Nokia Lumia 520