Thanks. Yes, probably it is some Android sound. But I can't find a way to mute it without muting all the sounds. Perhaps this could be added to the NFC Ring App: disable the sound and the vibration.
Posts made by paulotex
List of widgets does not seem complete
I'm using the "NFC Ring Unlock" app on my Xperia Z Ultra, and it seems the list of widgets to use on the lock screen is not complete. In particular, I'd like to place a clock there, and the widget list does not show any clock (but I can place a widget clock on my home screen).
Turn off device's NFC sound
My NFC ring arrived yesterday and everything seems fine. It fits (yay!) and it works with my Xperia Z Ultra.
However, each time I unlock the screen with the ring, the phone produces a short sound, probably to alert that some NFC device has been accepted.
This is really annoying, specially if I want to acess the phone to disable the sound (eg, I'm already in a conference or cinema and just realized that the phone is not on mute).
Is there a way to disable the NFC alert sound? I understand this is not specific to the ring, but probably to most Android phones.