You can add airplane mode toggle. Go to settings, action center, tap on an icon change. They're all just hot keys.
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It seemed to correct itself Saturday around noon. It was still failing Saturday morning. I tried to send in the error report, but that kept crashing with the app.
But like i said, seems good now.
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I don't know about percentage of bulb use. I believe with LCD screens, its either on or off, dimness or brightness may not effect lifetime of the screen.
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I won't use it in my 920 because our phones are back lit, and glance stays on when charging.
With any other Lumia, beside 520-620, the Amoled screens are much more suited for glance.
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