Hi, Falkon,
Thanks for stopping by the Apple Support Communities. If I understand your post, you're trying to connect to the iTunes Store on your iPhone, but are getting an error that you can't. I'm happy to help!
I see you've got concerns that the iTunes Store may not be available in your country. If that's the case, you wouldn't be able to connect to it, even if iTunesU works. To confirm if this is the issue, please locate your country in Availability of Apple Media Services - Apple Support and review what is available.
Should the iTunes Store be available in your country and you still receive an error that you're unable to connect, please use the steps in the Apple Support article If you can't connect to the App Store, iTunes Store, or Apple Books - Apple Support to troubleshoot.
Have a wonderful weekend.