I cannot sign in with my Apple ID
I try to sign in to the App store with my Apple ID and password, and I enter them correctly, but it doesn't take any action and doesn't sign in. I've tried to do it through the App store & the settings. I've tried rebooting the phone, I've tried changing the password and none of them works. The thing is that I'm not able to download any apps!
I own an iPhone 5 with iOS 8.03
iPhone 5, iOS 8.3