nfc on samsung nexus s

I have nexus s mobile with me. I am working with the smartcard apps on android. As i surff开发者_运维百科ing over net, I came to know that nexus s mobile is able to read the smartcard tags. When i tried to connect the smartcards which i have , I am unable to get the tag information and i have no Response. why is that not connected with nexus s . All i need to know is, Is there any specific needs the smartcards should satisfy to connect with nexus s ?? Or what kind of tags we can connect with nexus s mobile.

Can anyone pls give me your valuable suggestion.

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You can read all the tag types specified by TagTechnology with the Nexus S. If you can not read the Tag it could be a matter of malformed content, invalid authentication Keys (in case you are reading protected Tag such as a Mifare Classic or a Mifare Desfire), etc.

Instead of using default Tag read application, I recommend you the NFC Tag Info from NXP application. It gives you much more information about the underlying specification of the read tag.