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  2. Charge carrier density - Wikipedia

    en.wikipedia.org/wiki/Charge_carrier_density

    Charge carrier density. Charge carrier density, also known as carrier concentration, denotes the number of charge carriers per volume. In SI units, it is measured in m −3. As with any density, in principle it can depend on position. However, usually carrier concentration is given as a single number, and represents the average carrier density ...

  3. Charge number - Wikipedia

    en.wikipedia.org/wiki/Charge_number

    The charge numbers for ions (and also subatomic particles) are written in superscript, e.g. Na + is a sodium ion with charge number positive one (an electric charge of one elementary charge). Atomic numbers ( Z ) are a special case of charge numbers, referring to the charge number of an atomic nucleus , as opposed to the net charge of an atom ...

  4. 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.

  5. Collect call - Wikipedia

    en.wikipedia.org/wiki/Collect_call

    In the UK, a number of services offer reverse charge calling. A caller can dial the operator on 155 and request a reverse charge call. Before these services were discontinued, 08000MUMDAD, 08000686323, 0800 Reverse also provided reverse charge calls. Reverse charge calls can be made for free on some mobile networks, although the person being ...

  6. Telephone directory - Wikipedia

    en.wikipedia.org/wiki/Telephone_directory

    Telephone directory. A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a ...

  7. 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.

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