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Since purchasing my Samsung Nexus S I have been bombarded by 'New Tag Collected' Tag Type 'Unknown'.

I have since learned how to turn this off, but I was wondering what these Tags are and where are they coming from?

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For anyone who hasn't yet learnt how to turn this off, see this other question How do I Switch off NFC? android.stackexchange.com/questions/5188/… – GAThrawn Oct 6 '11 at 12:21

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Sounds like NFC terminology to me. Presumably either NFC is malfunctioning or you've been in the vicinity of NFC tags that are of a type your phone doesn't recognize.

Looks like ID badges and probably some credit cards and so on could trigger this: http://forum.xda-developers.com/archive/index.php/t-989630.html

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Looks like this previous question has someone getting this exact message when their phone is near their Oyster Card (contact-less public transport payment card used in London), so it looks like you're right, especially as some banks are starting to also embed these in their credit cards now too. – GAThrawn Oct 6 '11 at 12:25
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I had just activated my new credit card and it was sitting beside my Nexus S and this kept happening. After reading this I tested it and it was the credit card causing it to happen.

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you can search and buy protection sleeves ( google.de/search?q=credit+card+protection+sleeve ). If you wonder what kind of data can be read without protection sleeves: Pretty much, a german researcher recently published a small app that showed it (it got booted both from github and google play though). – ce4 Jun 27 '12 at 12:53

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