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2. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

3. Directory assistance - Wikipedia

   en.wikipedia.org/wiki/Directory_assistance

   In the U.S., directory assistance for companies with toll-free "800 numbers" (with area codes 800, 833, 844, 855, 866, 877, and 888) was available from toll-free directory assistance, reachable by dialing 1-800-555-1212, for many decades until it was discontinued in 2020.

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

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

   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 verification code, and how to turn off 2-step...

5. Morse code - Wikipedia

   en.wikipedia.org/wiki/Morse_code

   Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .

6. Telephone numbers in China - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_China

   China's mobile telephone numbers were changed from ten digits to eleven digits, with 0 added after 13x, and thus the HLR code became four-digit long to expand the capacity of the seriously fully crowded numbering plan. In 2006, 15x numbers were introduced. In late 2008, 18x and 14x (for data plans or IoT) were introduced.

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

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

   Add, replace or remove AOL account recovery info. 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.