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I did not know that an App can modify system behavior like this.

I have phone always on silent. I installed "Xiaomi Wear". During installation in Play Store, the phone made a short vibration. I thought that was weird, since the phone is on silent, and it never vibrates.

Anyway, after installation, the phone is now changed to vibrate every time I unlock it. A short vibration, but with full force (unlike when unlock with fingerprint).

Apparently, the phone scans NFC every time I unlock it - and since I have a bank card on the back, I guess it vibrates to signify it found something.

But I don't understand why an app can cause something like this, and how I can prevent it?

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  • Possibly related: How to stop Samsung Galaxy S20 vibrating on resuming and entering lock mode?; this one is due to the NFC setting being enabled. Otherwise, try to identify the cause by following How to determine which app is causing vibration?
    – Andrew T.
    Nov 29, 2021 at 9:19
  • Thanks, that led me understand why (NFC is scanning a card on the back of my phone). The question is still why, and how an app can cause this to happen every time the phone is unlocked. I edited the post.
    – James T
    Nov 29, 2021 at 9:24
  • If it's NFC, then I think that's the Android system itself that does the vibration and the Xiaomi Wear app might be a red-herring. Android system may bypass the user's setting. If possible, follow the second link to be sure which component did the vibration.
    – Andrew T.
    Nov 29, 2021 at 9:32
  • It stopped when I uninstalled Xiaomi Wear, and started again when I reinstalled it. So It's definitely that app that causes it, but I don't understand how that app can make a system wide change like that... Like mentioned, even during installation it made the phone vibrate - before I even opened the app!
    – James T
    Nov 29, 2021 at 11:05
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    I wanted to prevent the scanning, since I don't know what the purpose of scanning every time a phone unlocks is? It doesn't do anything, I get no prompt that NFC is found.
    – James T
    Nov 29, 2021 at 12:09

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