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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. 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".

  4. 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 ...

  5. Comparison of ICBMs - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_ICBMs

    800 kt Active 1985 No Road-mobile TEL: 200–900 m 6 RT-2PM2 Topol-M: Russia: Votkinsk Machine Building Plant 11,000 km 47,200 kg 800 kt Active 1994 No Silo, road-mobile TEL 200 m 7 RS-24: Russia Votkinsk Machine Building Plant 12,000 km 49,000 kg 3-4 x 300 kt Active 2007 Yes Silo, road-mobile TEL 150 m 8 R-29R: Russia State Rocket Center Makeyev

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

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

    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 general resource for questions you have about your Medicare ...

  7. 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)

  8. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Cellphone numbers are assigned the 1-digit area code 6, leaving eight digits for the subscriber's number: 06-CBBBBBBB, where subscriber's number ('C') is neither 6 nor 7. Service numbers (area codes 800, 900, 906 and 909) have either 4 or 7 remaining digits, making them 8 or 11 digits in total: 0AAA-BBBB or 0AAA-BBBBBBB. The area code 14 has no ...

  9. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    The Elo [a] rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess. It is named after its creator Arpad Elo, a Hungarian-American physics professor. The Elo system was invented as an improved chess-rating system over the previously used Harkness system, [1] but is also used as a rating ...