[heypiotr]

Actually, we did a bunch of testing at Estimote and we strongly suspect that the NFC in iPhones is just the "passive" variety, the same that's being put into contactless cards and the new Proximity Beacon => it's not capable of scanning other passive tags. Unlike the Androids, which are "active", i.e., can power the passive tags through induction & scan them. So it might actually be a hardware limitation, not just Apple's reluctance to open up the API.