From cmoore@brl.mil Wed Jul 15 10:39:51 1992 Received: from wumpus.brl.mil by gaak.LCS.MIT.EDU via TCP with SMTP id AA06236; Wed, 15 Jul 92 10:39:47 EDT Date: Wed, 15 Jul 92 10:38:48 EDT From: Carl Moore (VLD/VMB) To: telecom-request@eecs.nwu.edu, ptownson@gaak.LCS.MIT.EDU Subject: history.of.area.splits Message-Id: <9207151038.aa07651@WUMPUS.BRL.MIL> Status: R Generalizing prefixes from NNX to NXX (i.e., allowing N0X/N1X) is an alternative to splitting an area which has had only NNX up to this point. When an area has NXX (not NNX) prefixes, its long distance dialing instructions usually are: 7D or 1 + NPA + 7D within area (can no longer use 1 + 7D); 1 + NPA + 7D to other areas (can no longer use NPA + 7D); for 0+ calls, try 0 + NPA + 7D (some 0 + 7D would require timeout). In other words, the leading 1 (or 0) means that what follows is an area code. These instructions can, without further revision, accommodate area codes of form NXX, not just of form N0X/N1X, and thus I believe they will become universal when area codes must generalize to NXX, for which the deadline is July 1995. But since the first batch of NNX area codes will be of NN0 form, some areas might be able to keep 1 + 7D for intra-NPA long distance by disallowing prefixes of NN0 form; I do not know if this will be affected by use of 52x codes (x not necessarily 0) for Mexico. It is unclear how generalizing area codes to NXX would affect the policy of not using N0X/N1X prefixes until NNX starts running short. An exception to the above dialing instructions was discovered in Feb 1992 for 215-267 (Denver) and 215-484 (Adamstown) in Pennsylvania. These exchanges are served by Denver & Ephrata Telephone & Telegraph, which also serves a part of the 717 area, and which is keeping the old instructions (1 + 7D and 0 + 7D within area code), even though this will necessitate timeout resolution for some calls from the 215 portion of their service area. This will change only when it is about time for the NXX area codes. These areas have N0X/N1X prefixes: 213, California, July 1973 (7D on all calls within it) (later 213/818, now 213/310/818) (this area continued to publish 0+7D instruction for within-NPA 0+ calls) 212, New York, some days after 24 Nov 1980 (7D on all calls within it) (now 212/718, to become 212/917/718) 312, Illinois, Oct 1982--but got 1st N0X/N1X spring 1983? (7D on all calls within it) (now 312/708) 201, New Jersey (7D on all calls within it; also applies to 609) (now 201/908) 214, Texas, 1986 or 1987 (by July 1987) (1+NPA+7D on all toll calls; also applies to 817, at least in Fort Worth area) (now 214/903) 301/202/703, Maryland/DC/Virginia, 1987, due to DC area growth (1+NPA+7D on all toll calls) (301 now 301/410) 415, California, Feb 1989? (7D on all calls within it) (now 415/510) 404, Georgia, Oct 1989? (1+NPA+7D on all toll calls; also applies to 912) (now 404/706) 919, North Carolina, 2 Mar 1990 (1+NPA+7D on all toll calls; also applies to 704) 416, Ontario, 3 Mar 1990 (1+NPA+7D on all toll calls) (to become 416/905) 602, Arizona, 1 July 1990 (1+NPA+7D on all toll calls) 313, Michigan, 1990? (1+NPA+7D on all toll calls) (to become 313/810) 512, Texas, 9 Sept 1990 (1+NPA+7D on all toll calls) (to become 512/210) 205, Alabama, Dec 1990 (1+NPA+7D on all toll calls) 215, Pennsylvania, 20 May 1991 (7D on all calls within it; exception noted above, but the new instructions were also applied to: 717-354,355 New Holland 717-656,661 Leola 717-768 Intercourse) 206, Washington, 12 Jan 1992 (1+NPA+7D on all toll calls) 813, Florida, 7 Mar 1992 (1+NPA+7D on all toll calls) 713, Texas, 8 Mar 1992 (permissive dialing 8 Dec 1991) (1+NPA+7D on all toll calls) Areacode splits: If no date appears, the split may not have been announced publicly due to lack of direct-dial facility at the time, or may never have occurred. Early splits can only be guessed at with the following guidelines: If an areacode is of form N1X, it is in a state or province with more than 1 areacode. (The reverse, if it was ever true, is now obsolete.) If an areacode is in a state or province with only 1 areacode, it is of form N0X. (The reverse, if it was ever true, is now obsolete.) what?/209 California what?/707 California what?/805 California 305/813 Florida 404/912 Georgia, 1953 or 1954 December 1991 Greater Atlanta call guide, in discussing 404/706 split, said "It's been 38 years since Georgia added an Area Code." what?/309 Illinois 502/606 Kentucky 504/318 Louisiana 616/906 Michigan, sometime after Nov 1960 612/507 Minnesota 402/308 Nebraska what?/607 New York 704/919 North Carolina 405/918 Oklahoma 901/615 Tennessee what?/806 Texas 206/509 Washington what?/608 Wisconsin what?/705 Ontario what?/807 Ontario 201/609 New Jersey, late 1950s 415/408 California, 1960 305/904 Florida, July 1965 703/804 Virginia, 24 June 1973 at 2:01 AM 714/619 California, Nov 1982 713/409 Texas, Mar 1983 (full cutover 90 days later) 213/818 California, Jan 1984 212/718 New York, 2 Sept 1984 (full cutover 31 Dec 1984) Brooklyn, Queens, Staten Island became 718; Manhattan & Bronx stayed in 212; Bronx to switch from 212 to 718, 1 July 1992 303/719 Colorado, 5 Mar 1988 305/407 Florida, 16 Apr 1988 617/508 Massachusetts, 16 July 1988 312/708 Illinois, Nov 1989 (full cutover 9 Feb 1990) 202 District of Columbia & vicinity, 1 Oct 1990 This behaved somewhat like a split despite no new area code. 202 area code, previously useable for all but the outermost Maryland and Virginia suburbs, was restricted to DC proper. (Use 301 or 703, as the case may be, to reach the suburbs.) As a result, government offices (now including the Pentagon) using zipcodes starting with 200,202,203,204,205 and located in Md. or Va. can no longer be listed in area 202. Prefixes in the Pentagon, which is in Virginia, were previously in area 202 (not 703), and in 1990 were moved to area 703. (Local calls across area code border changed from 7D to NPA+7D.) 214/903 Texas, 4 Nov 1990 (full cutover 4 May 1991) 201/908 New Jersey, 1 Jan 1991 (full cutover 8 June 1991) 415/510 California, 2 Sept 1991 (full cutover 27 Jan 1992) 301/410 Maryland, 1 Nov 1991 (full cutover 1 Nov 1992) 213/310 California, 2 Nov 1991 (full cutover 16 May 1992; was to be 2 May 1992, but was postponed indefinitely because of riots just before then) (all GTE plus some PacBell went into 310) 212/718/917 New York, 1 Jan 1992 (917, to be overlaid on 212 & 718, is to be used for cellular & pagers) 404/706 Georgia, 3 May 1992 (full cutover 3 Aug 1992) 512/210 Texas, 1 Nov 1992 (full cutover 1 May 1993) 714/909 California, 14 Nov 1992 (full cutover 14 Aug 1993) (Riverside and San Bernardino counties go into 909; Orange County remains in 714) 416/905 Ontario, 4 Oct 1993 (full cutover Jan 1994, no exact date yet) 313/810 Michigan, 10 Aug 1994 On Feb 1, 1991, area codes 706 and 905, which had been used in the U.S. for calling parts of Mexico, were discontinued. Country code 52, already available for such calls, was to be used. 706 and 905 thus became available for use elsewhere, and were later announced for use in Georgia and Ontario respectively.