I have an S4 with which I try the Yubikey Neo with NFC on. I also tried another tag but I can't get any response from the phone whatsoever. Not even a beep. NFC is turned on for sure.
I bought an (relatively) expensive original battery (not from any suspicious ebay dealer) and it says Near Field Communication on it, as I understand the antenna is located ontop of the battery.
Does anyone have any ideas why it doesn't work? Is there a way I can test if the NFC is completely dead, or some logs I can look into? I have tested various apps for my tags but can't seen anything.