[lxgr]

If you only care about static data that you can optionally freeze to a permanent read-only mode, NTAG21[3|5|6] tags are probably among the cheapest ones that reliably work with all iOS and most Android devices.

MIFARE Classic supports (completely broken and for this use case) useless encryption and doesn't work with some Android devices, as they're not really a part of the standardized NFC stack.

If you want to get really fancy, you can also get a Java Card based smartcard and install an NDEF application yourself. You could then also install a FIDO application and use the same card as a "homebrew Yubikey" :)