If you see a message that your account has been locked, sign in to get a security code and unlock your account.
You can use any phone number to request the security code.
The phone number does not need to be associated with your account.
The phone does not need to be a smartphone, or connected to the internet, it just needs to be able to receive text messages.
You may have to create a new password. Read tips on how to keep your account safe.