You might see one of several kinds of messages related to wireless tags near your iPhone.
Small and portable : the size of round NFC card is 25 mm in diameter, small and portable to carry, laminated white PVC cards thick plastic credit card
K LAKEY 10pcs Black NTAG215 NFC Tag Round 25mm(1inch) NFC Business Card,Blank Waterproof PVC NFC Tags,Compatible with NFC Enabled Mobile Phones
8 Ways to Fix NFC Not Working on iPhone - TechWiser
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Macworld UK September 2023 (Digital)
【NFC Tags】30pcs NTAG215 NFC Tags Round 1.18 inch/ 30mm, No Adhesive, made of durable waterproof PVC material, Not designed for use on metal surfaces.
30pcs NFC Tags NTAG215 NFC Cards 30mm(1.18 inch) NFC Coins No Sticky, Compatible with TagMo and All NFC-Enabled Smartphones
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Glenn Fleishman, Author at Macworld
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On the Apple Watch and iPhone 6/6+
Glenn Fleishman, Author at Macworld
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NFC tag detected?
Use Shortcuts and NFC Tag to remember to take out trash weekly : r/shortcuts