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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. Telephone numbers in Slovakia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Slovakia

   Telephone numbers in Slovakia. This page details the format and usage of telephone numbers in Slovakia. Today, Slovakia uses a closed numbering plan with area codes beginning with 0. After 0, there is usually a 2-digit prefix, followed by a 7-digit subscriber number. The capital, Bratislava, has one-digit prefix and an 8-digit subscriber number ...

4. Extended real number line - Wikipedia

   en.wikipedia.org/wiki/Extended_real_number_line

   Extended real number line. In mathematics, the extended real number system [a] is obtained from the real number system by adding two infinity elements: and [b] where the infinities are treated as actual numbers. It is useful in describing the algebra on infinities and the various limiting behaviors in calculus and mathematical analysis ...

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

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

   Call paid premium support at 1-800-358-4860 to get live expert help from AOL Customer Care. Find out how to add or delete a recovery mobile phone number or alternate email address from your AOL account.

6. Learn more info about AOL 24x7 Live Support - AOL Help

   help.aol.com/articles/aol-24x7-live-support-faqs

   To get technical assistance once you’ve signed up, please call the phone number provided with your 24x7 Live Support subscription in MyAccount. Our live experts are here to help you over the phone 24x7, or via chat from 8AM-1AM EST, 7 days a week.

7. Direct inward dial - Wikipedia

   en.wikipedia.org/wiki/Direct_inward_dial

   Direct inward dialing ( DID ), also called direct dial-in ( DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate private branch exchange (PBX) systems. [1] [2] The feature provides service for multiple telephone numbers over one or more analog or digital physical circuits to the ...