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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. 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 ...

  3. 1-800 Contacts Review - Healthline

    www.healthline.com/health/1800-contacts

    On Trustpilot, 1-800 Contacts has a little more than 200 reviews with a 3-star average. Ratings are split pretty evenly between poor and great, giving it 2.6 stars out of 5. This brand reputation ...

  4. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话". The official name is "被叫集中付费业务" (called party collect paid service), which means the cost of the call is borne not by the caller but by the party receiving the call. 800-toll-free numbers in China are ten-digit numbers beginning with "800".

  5. 800 MHz frequency band - Wikipedia

    en.wikipedia.org/wiki/800_MHz_frequency_band

    The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz.. Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470 MHz to 862 MHz) it was allocated by the ITU to Broadcasting as the primary user in Region 1 and was used for analogue television broadcasting before changing to digital terrestrial television in many ...

  6. Contact AOL customer support - AOL Help

    help.aol.com/articles/account-management...

    In addition to the support options listed above, paid members also have access to 24/7 phone support by calling 1-800-827-6364. Learn about the support options AOL offers and how to access help for your question or issue.

  7. What Is the Medicare Phone Number to Call If You Have Questions?

    www.healthline.com/.../medicare-phone-number

    You can call Medicare anytime for help with your coverage. The number to call is 1-800-MEDICARE (1-800-633-4227). The TTY (TeleType) number is 1-877-486-2048. This phone number is meant to be a ...

  8. List of common display resolutions - Wikipedia

    en.wikipedia.org/wiki/List_of_common_display...

    16:9. 8,294,400. 7680 × 4320. 8K UHDTV. 4320p. 33,177,600. Many of these resolutions are also used for video files that are not broadcast. These may also use other aspect ratios by cropping otherwise black bars at the top and bottom which result from cinema aspect ratios greater than 16∶9, such as 1.85 or 2.35 through 2.40 (dubbed ...

  9. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness comparison table. Brinell HB. (10 mm Ball, 3000 kg load) Vickers HV. (5 kg) Rockwell C HRC. (120 degree cone 150 kg) Rockwell B HRB. (1/16" ball 100 kg)

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