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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
OCB-283 - Another name for more modern versions of E10B and often the name used in India to distinguish it from older versions. E10-MT formerly Thomson MT-25 found mostly in France, and MT20 too. E10-Five E10B adapted for the North American environment as a class-5 switch. E10S satellite switching unit.
Claro Puerto Rico, which serves every exchange in Puerto Rico, has been owned by the international telecommunications giant América Móvil since in 2007. Ziply Fiber, which serves ex-GTE areas in the Pacific Northwest that they bought from Frontier. Many other individual communities or smaller regions are also served by non-RBOC companies.
Name Notes 1ESS: Number 1 Electronic Switching System (Alcatel-Lucent) US 1FR: Flat rate service: US 2G: second-generation mobile telephone 2.5G: Enhanced 2G mobile telephone 3G: third-generation mobile telephone 4ESS Number 4 Electronic Switching System (Alcatel-Lucent) 4WTS: Four-wire termination set: US 5ESS
United States telephone numbers often included letter prefixes and telephone exchange names, which were more easily memorable for users than long digit sequences. Subscriber number The subscriber number is the address assigned to a telephone line or wireless communication channel terminating at the customer equipment.
Many mobile phones allow the + to be entered directly, by pressing and holding the "0" for GSM phones, or sometimes "*" for CDMA phones. The 3GPP standards for mobile networks provide a BCD-encoded field of ten bytes for the telephone number ("Dialling Number/SCC String"). The international call prefix or "+" is not counted as it encodes a ...
The exchange provides dial tone at that time to indicate to the user that the exchange is ready to receive dialed digits. The pulses or DTMF tones generated by the telephone are processed and a connection is established to the destination telephone within the same exchange or to another distant exchange.
This was the standard in most of North America from the 1950s onward. In some small villages with only one local exchange, it may have been permissible to dial only the four-digit station number. Even after exchange names were introduced, it was possible in many small cities to call local numbers by dialing only the five digits which followed.