I came into the hotel bathroom where the iPhone was charging and as I opened the door the phone chirped to say it was charge cycle was complete. I thought, "Wow what a coincidence that it finished just as I opened the door". The next time I opened the door, I noticed that it had woken up again and was displaying the charge status, so it seems like the iPhone is assuming that if it suddenly gets light, that some human might be coming to see it and will be interested in it's battery status. That is smart.
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