The UID of the active NFC tag changes, why is that?

Question

NFC

Good afternoon, I want to read the UID, nfc tags in the SAMSUNG phone, and for some reason the UID is constantly changing, I read the UID, he immediately read it and here it is again different. Tell me why so

Answer 1

Your phone does not have a tag.
There is a reader and he himself generates the identifiers of the emulated label.