We have had a few clients that use the latest Samsung mobiles have issue reading NFC tags of different types. The problem seems to be that more people are using their mobiles for NFC payments and are used to placing the top of their mobile on NFC payment terminals. This is because NFC payments use the MST antenna positioned below the camera, where as the NFC antenna for reading and writing to tags is around the middle of the mobile on on the back.Another aspect to consider is when making payments you are using a NFC transmitter that is powered and so the connection range is more powerful and wider. As NFC tags use the power of the mobile it is necessary to find the right spot on the back of the mobile to create a solid connection.
We hope this information helps when using NFC