Problems starting or charging the iPhone

I now already had two times the problem that the completely drained battery of my iPhone did not want to charge anymore. The only thing I see, is the empty battery symbol. But, this does not change, even after having it plugged in for many hours. Also there is no way to start the iPhone.

Fortunately, I found a solution somewhere in the Internet and thought I might also share the trick to revive iPhone charging again:

1. Plug the iPhone to a power source (PC via USB or charger), let it there for 15 minutes and do not worry if there is no indication that the battery is charging.
2. Put the side switch of the iPhone to silent mode (the red dot should show).
3. Unplug the iPhone form the power source and make sure it is turned off.
4. Toggle the side switch of the iPhone four times (normal - silent - normal - silent).
5. Press the home and power button (the one on top of the iPhone) simultaneously until the Apple logo appears (should take about 10 seconds).
6. Plug the iPhone to a power source and let it fully charge, you can now use again your iPhone.