We have a mifare card system and are looking into the possibility of using NFC chips in phones as mifare cards.
I have done a bit of research into NFC but the question that I cannot answer is do NFC chips in mobile phoned have a unique identifier that I can read like a mifare card has ?
Also if the NFC chip dies have a unique code can I just read it using the NFC reader or do I need an application on the phone to put it into card-emulation mode ?
Answer
I work for a large agency and this same question was proposed. In summary, I was able to successfully emulate a mifare classic chip (our id card) and gain access to all facilities as if I was using my id card (lenel access control). However, in the end the solution was a hack and a half. Only devices with NXP NFC controllers could this be possible on. Further, I had to modify the nfc_access.xml (remount the file system to rw) system file and include the signature of the application. Then using reflection, enable mifare emulation. Then using a mifare reader/writer (hid 6055b), I encode the data (sectors and blocks, in my case sector 1) onto the phone. In essence, I treat the phone as a mifare ID card. That is, i copied my id card to the phone. You can't programmatically set this.
NXP owns mifare. Mifare sits above the iso14443 part 3 specs and implements a proprietary communications protocol. This protocol is only implemented in the secure element which is also owned by NXP. This is why devices equipped with broadcomm chipsets can't read mifare (e.g. nexus 5).
Although I proved it possible, it is not feasible for production.