and the phone OP, can't turn on by itself while charging, you have to press and turn it on, so there it is, even if you did not have it on electricity, there is no way it could turn on by itself because of starting to charge, of course you will say taht you have put to open at a specific hour but then you would now know that it went off, and solar charging needs a lot of time to charge a battery, and hasn't got the amps to sustain an open smartphone with only the solar energy.