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Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, or 888.Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future.
800 are used for toll free numbers. 801 numbers used to be for premium-rate telephone numbers (such as 1-900 numbers in the United States) . Nowadays 900 numbers are premium-rate telephone numbers. 900–999: Campeche, Chiapas, Oaxaca, Puebla, Quintana Roo, Tabasco, Veracruz and Yucatán
Canada and the United States have experienced rapid growth in the number of area codes, particularly between 1990 and 2005. The widespread adoption of fax, modem, and mobile phone communication, as well as the deregulation of local telecommunication services in the United States during the mid-1990s, increased the demand for telephone numbers.
Toll-free telephone service is a telecommunication service in which subscribers are assigned telephone number in NPAs 800, 888, 877, 866, 855, 844, and 833. Calls to these numbers incur no toll charges for callers. The American Telephone & Telegraph Company (AT&T) first introduced 800 toll-free service in 1967. [2]
[4] [5] In practice, some RespOrgs do abuse the system by stockpiling millions of toll-free numbers for advertising purposes, because the enforcement of the regulations has been weak and sporadic. This situation has led to periodic creation of overlay plan toll-free area codes to prevent exhaustion of the SMS/800 available number pool.
A typical mobile phone number is written as 01M-XXX YYYY or 01M-XXXYYYY. Toll-free and local charge numbers are written as 1-800-XX-YYYY and 1-300-XX-YYYY respectively, while premium rate numbers are written as 600-XX-YYYY.
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). If there is only 32.. followed by any other, shorter number, like 32 51 724859, this is the number of a normal phone, not a mobile. 46x: Join (discontinued mobile phone service provider) [3] 47x: Proximus (or other) 48x
800-toll-free numbers in China are ten-digit numbers beginning with "800". There is no prefix before "800". 800-toll-free numbers are not accessible to mobile network subscribers and some land-line subscribers. For instance China Tietong Telecom land-line users cannot access 800 numbers.