I don't believe you can delete locked files unless you hack into the device. Not sure why you want to delete them they don't take up much room.
Never have heard anyone complain about ringing to loudly. If you use a case it should not be loud. One of the third party apps may be able to decrease the volume for you.
I hope you get a better response to your post.....
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Plunker
Just trying to learn and talk at the same time here.
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