Update 2: I called Apple’s hotline. Their robot first told me i had to pay 35 € in advance in order to tell them about the problem. I tried it anyway. The guy on the phone told me that in this case they’ll talk to me without Apple Care. Unfortunately they only proposed a repair option for 160 €.
He couldn’t tell me what would have happened when the phone had burned the sofa. Anyway i’ll now will give my old iPhones to recycling and not display them in the shelf. Poor old first gen iPhone.
And no. I didn’t use the iPhone since 2009 after Apple declared to use location data.
Update: Damn. This thing is still growing. I’ll better bring it outside.
I am happy the sofa didn’t burn, too.