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His residence was phone number 1 and his shop was phone number 2 in Boston. ... Although in many areas being a prefix of 55 plus the thousand digit of 5 (e.g. 55 5XXX ...
Two-digit numbers were sufficient on small exchanges with fewer than 100 subscribers, while exchanges with a few hundred lines used three-digit subscriber numbers, e.g. 200–499. Larger exchanges which covered thousands of lines used four-digit subscriber numbers, e.g. 2000–5999, or five-digit subscriber numbers, e.g. 20000–49999.
The first automated dial exchanges in the Bell System were deployed in 1919. [5] When seven-digit telephone numbers were first assigned in New York in 1920, [6] the three-letter four-number (3L-4N) system had represented the number in the format PENnsylvania 5000. Similar systems were used in Boston, Chicago, and Philadelphia.
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]
Because telephones of this era, e.g. the Western Electric 302 desk rotary phone or the M3 354 wall telephone, were designed to send pulses or clicks to the central office's switching station, smaller digits were quicker to dial. This makes the fastest-dialing area code 212 (5 total clicks), followed by 312 and 213 (6 clicks).
Since it was the only former exchange name which started with the 5 digit, numbers beginning 061 5xx xxxx were never allocated (until 2015, when a small number of new levels - 0161 5xx xxxx - were released into circulation, primarily for business customers).