If you have been using cellular data, switch to Wi-Fi. You can visit Apple system page to check if the i Tunes Store system is down.
This page is available on Apple official website and contains information about system status of Apple Services, Stores, and i Cloud.
An unknown error has occurred” , “We could not complete your i Tunes Store request” or “i Tunes could not connect to the i Tunes Store.”See also: How To Fix i Phone/i Pad Won’t Download Or Update Apps This is pretty simple.
If you have been using Wi-Fi, switch to cellular data.
Nevertheless, this issue can be fixed with a couple of simple steps wherein you simply logout and then login to the App Store on your i Phone or i Pad.When that is not the case, there are some solutions you can check out, and get rid of the issue.