Nobody? I emailed simonsvoss USA, they answered:

"Thank you for your enquiry, I am sorry but our locks are not compatible with NTAG Chips.
Our Locks only support Mifare Classic, Mifare Desfire and Mifare Plus chips."

I don't understand as their locks work with 13.56MHz MIFARE S50 Classic 1k cards and keyfobs and are stated as ISO 14443 certified. In NFC ring's FAQ, we can read:

• Q. Which digital door locks work with the ring?
• A. All door locks with NFC(ISO14443) should work fine.

So what is missing?

Apple has finally announced that the NFC chip in the iPhone 7 (and presumably iPhone 7s and/or iPhone 8) will be available for developers to interact with NFC tags when iOS 11 is ready Q3 2017 (as well as the Apple Watch with watchOS 4)

Does that mean the NFC ring will be able to unlock the iPhone, interact with it ant that there may be some kind of app like NFC tools in the App Store?

• https://developer.ibm.com/dwblog/2017/nfc-ios-reading-nfc-tags/
• https://developer.apple.com/videos/play/wwdc2017/718/

An electronic cylinder is a passive lock (no motor like keyturners). The door stays locked until you show an RFID card, and the cylinder unlocks so you can manually turn the lock and open the door. Advantages are: quick operation, compatibility with all doors including those with multiple bolts hard to turn, and long battery life (about 3 years).

There are many manufacturers of RFID European electronic cylinders. Are they compatible with NTAG chips (NTAG203 and NTAG216) in NFC rings?

Below I selected only cylinders compliant with ISO/IEC 14443. They are basically advertised as working with 13.56GHz MIFARE (1k, Ultralight and also DESFire for some of them):

• Simons-Voss 3061

• Uhlmann & Zacher Clex Prime CX2182

• Zalix ZX-WL7100

• Pollux EasyLock

• CEStronics OMEGA FLEX Home & Office

There are many others… including this cheap one :

• EASTWU Rocket ED01-MF1
  (but it is not stated if it's also ISO-14443 compliant, too bad because it also has physical keys, this is good if you come home to find the battery is dead and you can't open the door) EDIT: the seller answered: "this product doesn't match you requirement"

Hi, I understand MIFARE cylinders and NTAG chips used in NFC rings share the same NFC frequency (13.56 MHz) and the same ISO/IEC 14443 standard. I don't understand the limitation, especially as NFC ring say in their FAQ:

"All door locks with NFC (ISO14443) should work fine."

So maybe the cylinder you bought is not ISO-14443 compliant?