"NFC tag" with a concentric pattern printed on it. The appearance is reminiscent of a magnetic sticker for health, but the pattern of the antenna is printed on the surface, and it operates with the power received by the induced magnetic field just by sticking it on an appropriate place. So you can communicate with NFC-enabled devices such as smartphones without batteries / batteries.
IPhones 7+ / iOS 11+ can read their NFC tags. Since iOS 13 also supports writing to NFC tags, it is now possible to write data to NFC tags sold for about 10 sheets / 1,000 yen and use them as "original NFC tags".
However, as of iOS 14.5, writing to NFC tags is not supported as a system standard feature / app. You will be writing using a third-party app such as "NFC Tools" obtained from the App Store.
Moreover, when reading the NFC tag data and taking some action, some data such as phone numbers (calling with the phone app) and URL (opening the WEB page with Safari) can be handled with iOS functions, but all data It is not possible to respond appropriately to.
For example, even if you write the Wi-Fi access point information in the NFC tag, it cannot be automatically set as a Wi-Fi access point on the iPhone unless you have a third-party app such as "Wi-Fi NFC". Currently, Android OS has more data types and is easier to apply.
If you use the "Shortcut" app of iOS 13.1 or later, you can perform automated processing in response to NFC tags, but this app only executes processing using the NFC tag-specific ID as a trigger. It is not useful for distributing Wi-Fi access point or address book data to unspecified smartphones, so it is better to use a third-party app.
