Several users have reported that they are unable to connect to the iTunes and/or App Store. They are getting “Cannot Connect to iTunes Store” errors preventing them from buying, downloading and updating their apps.
There may be many reasons for this problem. For instance, you may have an internet connection issues or Apple servers may be having problems. However you may also be victim of a known bug. To resolve this bug, simply tap Settings>General>Date and Time. Set the date ahead to some time in the future. Then try to connect iTunes or App Store again.