> can't we use that to emulate all our Mifare cards? Unfortunately, no. From my experience at least, most access cards are simple mifare classic cards, and th

> can't we use that to emulate all our Mifare cards? Unfortunately, no. From my experience at least, most access cards are simple mifare classic cards, and they have no payload: the reader just got a list of allowed card IDs, maintained by the building IT. While you can freely rewrite mifare data from Android, it won't let you change your ID unless you root your phone. I guess this is similar to the old days where you weren't supposed to change your MAC addresses.