I had a similar problem back in the days. A new sim card fixed it for me.

On my phone I can see in the status bar that there is no data. I often switch off data so I am used to just glance at the status bar for... status

If you only use it around the house I think you will be ok.

Funny enough I use a tablet for bed.

We are not the same

If that is the case surely you can get Att to un-black list it then

I know you asked for no replies from people who do not understand Rsim.

But are you not encouraging iPhone theft by buying black listed phones?

Who ever sold you that phone should be punished one way or the other. If phone is black listed by mistake, get it fixed.

Not a German, but I believe it has something to do with free open source software. And this is not something Apple is renowned for.

Other times there have been cases where Microsoft Windows (and Office) have been replaced with Linux and Libre office (or was it Open Office).