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2. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. Add or disable 2-step verification for extra security. Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a ...

3. Add, replace or remove AOL account recovery info - AOL Help

   help.aol.com/articles/add-or-update-aol-account...

   Keep a valid mobile phone number or email address on your account in case you ever lose your password or run into a prompt to verify your account after signing in. We'll also include your recovery email address when sending a notification of changes made to your account. Add a mobile number or email address

4. Fictitious telephone number - Wikipedia

   en.wikipedia.org/wiki/Fictitious_telephone_number

   Telephone numbers starting with the digits 555 are assigned to subscribers as ordinary numbers. Hungarian taxi company Tele5 Taxi uses 555-5555 as a vanity number, [21] while at least one company specializing in vanity numbers [22] sells cell phone numbers starting with the digits 555 for a premium rate, capitalizing on their fame in American ...

5. Luhn algorithm - Wikipedia

   en.wikipedia.org/wiki/Luhn_algorithm

   Luhn algorithm. The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in US patent 2950048A, granted on 23 August 1960. [1]

6. Why am I asked to verify my account after signing in?

   help.aol.com/articles/why-am-i-asked-to-verify...

   Please review your account settings and recovery methods from time to time, and especially prior to changing phone numbers or other email addresses, to help ensure you can always access your account!

7. Personal identification number - Wikipedia

   en.wikipedia.org/wiki/Personal_identification_number

   Personal identification number. A personal identification number (PIN), PIN code, or sometimes redundantly a PIN number, is a numeric (sometimes alpha-numeric) passcode used in the process of authenticating a user accessing a system. The PIN has been the key to facilitating the private data exchange between different data-processing centers in ...