I was wondering my my NFC tags didn't work and now I know. The S4 doesn't support the older version of tectiles. I guess an update is coming in a few weeks to make it backwards compatible.
See here for yourself
Samsung Galaxy S4 doesn?t support older NFC TecTile tags. Awaits Arrival of TecTile 2
See here for yourself
Samsung Galaxy S4 doesn?t support older NFC TecTile tags. Awaits Arrival of TecTile 2