Last few days have been unable to connect to the App Store on my iPhone 6S, iOS 10.1.1. Checked everything that Apple Support pages said, still no luck: https://support.apple.com/en-au/HT201400
Username and password were correct, could connect to icloud.com and appleid.apple.com as well as iTunes on macOS.
Saw an option to get online support so tried that. He ended up telling me that he was an iTunes store advisor and only handled cases related to billing and buying, but that I could call the technical team on (61) 1-300-321-456. So I did, even though my iPhone is >12 months old and I don't have Apple Care. Took about 2-3 minutes to get through and I told the lady I wasn't sure if I was eligible for phone support, she said no problem and helped me anyway.
As some of you may have guessed, the issue was fixed by resetting network settings. I wish they would add that to the link I posted above. I hate wasting people's time with something I can look up online. Anyway, yet again I am very happy with the support I receive from Apple. If they didn't make the MacBooks less appealing every year, I'd hardly ever have a bad word to say about the company.