There is no Internet in German hotels? No phone?

Yes, country hotels. Only small private country hotels in remote areas may not have Internet access, but they definitely have telephones. Although there may not be telephones in the rooms, the boss will set up a public telephone at the registration desk. And if you’re on a business trip, you won’t go to such a remote place, right? That kind of place is usually only known by locals, and foreigners generally don't go there. Even if they go to live in such a place, only backpackers will stay. Of course, this is what I know, and your friend may encounter other situations