Why my S3 device sounds when magnetic card is put on its back?

Question

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Why does my Galaxy S3 make a noise when I put it down?

Why my samsung S3 play a sound when I put above my gym magnetic card? Only with this card the device play this type of sound. Nothing happen if I put it above credit card or other magnetic/chip support. The gym card open doors and let me enter inside the gym if I've paid. There's a way (maybe an app) to read what happen when my s3 grab that card?

You were right. For magnetic card I mean a card with a band all along the card, in opposition to chip card i.e. a card with a single chip on it. My gym card doesn't have a chip (or at least I haven't found it), so it's more likely that this is a magnetic one (even if I can't see a sort of magnetic bar). — BAD_SEED, Oct 18 '12 at 19:18
Seems like a duplicate of Why does my Galaxy S3 make a noise when I put it down? — ale, Oct 18 '12 at 19:21
Yes, it's duplicate. Confirmed that I want something to read data above card and data exchanged between devices. — BAD_SEED, Oct 18 '12 at 19:24

score 4 · Accepted Answer · answered Oct 18 '12 at 19:22

Your S3 has an NFC chip in it that can read and write NFC tags which are a type of RFID. RFID is most commonly used for things like identification chips for dogs and NFC for public transport payment cards like Octopus or Oyster. It's also in quite a lot of credit and debit cards now too.

The card will have some kind of tag in it - the NXP TagInfo app will give you information about what kind of tag it is.

Why my S3 device sounds when magnetic card is put on its back?

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