iPhone built-in RFID-NFC Read Distance Varies Based On Inlay/Tag Antenna Size

How do you know the read distance of the iPhone built-in RFID-NFC reader?
Will a small NFC tag give the required distance?
How big do you need to have an NFC inlay-tag to get a long read distance?

This video uses iPhone 11, the same results will correlate with iPhone 12, and iPhone 13, iPhone 14, iPhone 15, etc.

The iPhone built-in RFID-NFC distance between the iPhone and varies based on Inlay/Tag antenna size Round and square antenna shapes are both produce the same correlation: large NFC/antenna/tag size means longer read distance.

All NFC inlays in the video are NXP NTAG213 chips, except the wristband NFC tag is NXP Mifare Ultralight EV1 chip.

The NFC chip type also has an effect on reading distance see this video for more information:…

Small NFC antenna 12x20mm gives read range of about one ‘one finger width’ in this video about 18mm Large NFC antenna 85x54mm gives read range of about one ‘four-finger width’ in this video about 65mm