I am unable to get an iPhone Xr (iOS 18) or iPhone 15 to interact with Texas Instruments RF430CL330H NFC tag. This is an ISO 14443B-compliant tag supporting NDEF. It is NFC Tag Type 4. A Samsung S23 with Android 14 and NFC Tools v8.11 reads and writes NDEF data with this tag as expected. The iPhones with NFC Tools v2.31 do not. For the following comparison the NDEF memory is written with a pre-loaded text data record. NFC Tools on Android reports the following: Tag Type: ISO 14443-4 Technologies Available: IsoDep, NfcB, Ndef Serial Number: Format: NFC Forum Type 4 Text Record 1: UTF-8 (en) Hello World! NFC Tools on iOS (iPhones) reports the following: Tag Type: ISO 7816 Technologies Available: Unknown Serial Number: Format: <no entry, not listed> Text Record 1: <no entry, not listed> Error response: "This nfc tag is not supported" Attempting to write a text message with NFC Tools on the iPhones returns "An error occurred during writing process" Other NDEF records (URL and Search) written into memory with the Samsung NFC Tools are also not readable with the iPhones. The iPhones are able to obtain the tag type and serial number of the chip, so there is some limited interaction. Is there a compatibility issue with the Type B tag, or perhaps something else?