Can't connect to App Store or open any apps
I tried accessing the apps in my phone, but it opened up the iTunes sign in window, even though I never signed out. So when I signed out of iTunes/App Store in settings, I couldn't sign back in. it keeps showing the 'can't connect to app store' message. I never changed my password, I'm not in the middle of updating anything, but my phone isn't the most up to date. My iOS version is 8.1.3. But I didn't have any problems before this. Could someone please explain to me what's going on? i read about others experiencing this problem sometime in March and it seems the problem is happening to me now. Is there anything I could do?
iPhone 5, iOS 8.1.3