Apple ID Not Working in App Store or iTunes on iPhone5
Recently, my son's iPhone 5 started behaving strangely. First, he "loses" texts sometimes. Second, he cannot log into the app store or to iTunes with his Apple ID. We can complete the log-in process from a computer, but not from his iPhone. For example, if I go to the iTunes and App Store under General Settings on his iPhone, enter is ID and PWD and click sign-in, nothing happens. I just get the Sign-In highlighted again. Similar behavior if I try to go directly to the App Store.
I have removed restrictions from his phone in an attempt to correct.
Any help would be greatly appreciated!