Originally Posted by Warbuff
Hey can you explain the reason why? Is there some sort of NFC specs? sort of how there are HDMI specs v1-v4?
Mifare Classic 1K tags *aren't* part of the NFC Forum specs. They are a legacy tag. NXP's controller (the one used in the Nexus S, Nexus 7, Galaxy Nexus, S3, etc) supported them in Android though.
They aren't supported on other devices (Blackberries, Windows Phone 8) as they technically aren't part of the NFC Forum standards.
With the Nexus 4 the NFC controller isn't from NXP. As a result it won't support the Mifare Classic 1K tags.