Apps

If the message specifically refers to the App Store and iTunes, click here and contact Apple Support at a time they're open. If not, click here.

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Be Skeptical. If it says you cannot login, you need to contact Apple.

If it says "your account has been disabled" (except for too many failed login attempts) DO NOT call any numbers you see on screen -- it may be malicious software or malicious pop-up ads.

If you choose to call them, use the contact links and phone numbers Niel provided above or ONLY from the Apple web site.