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annoying / weird system sound on Android (Nexus 4)

I recently applied a NFS tag from my bank and attached it to my Android phone (Nexus 4). Then I found every time I power on (not boot up) the phone, there will be weird sound. I tried to disabled all the possible setting under sound section in settings, but the sound still there. Then I realized it may caused by the NFS tag, so I went to settings -> Wireless & networks -> more , and unchecked the "NFC" option, and the weird/annoying sound gone.

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