If you end up in a situation where your iPhone just won’t boot up anymore (not even showing the empty battery icon nor the Apple logo) – or it is simply not recognized in iTunes anymore – it might be, that some of the pins in the Dock connector are be broken. At least that was what happened to me.
Fortunately you can get a replacement of the exact same iPhone model at your local Apple Store for some bucks (which are a lot below the price you would have to pay for a completely new iPhone model).
Thanks to my friends @dikk and @appleadvisor for their kind support!
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