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One of the many security safeguards on your account is the “Mobile Locked” error. It displays on the mobile sign-in page whenever someone has made multiple failed attempts to sign in to your Yahoo ID using a mobile device. Fixing the error is easy — just sign in to your Yahoo ID from a computer.

  1. On a desktop computer, go to the Yahoo sign-in page.
  2. If you’re already signed in, click Is this not you?
  3. Enter your Yahoo ID and password.
  4. Click Sign In.
  5. Sign in to your Yahoo ID using your mobile device.

Or contact yahoo help