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Area codes are also known as Numbering Plan Areas (NPAs) and formerly known as STD codes in the UK. These are necessary (for the most part) only when dialed from outside the code area, from mobile phones, and (especially within North America) from within overlay plans. Area codes usually indicate geographical areas within one country that are covered by perhaps hundreds of telephone exchanges, although the correlation to geographical area is becoming obsolete.

The area code is usually preceded in the dial string by either the national access code ("0" for many countries, "1" in USA and Canada) or the international access code and country code. However, this is not always the case, especially when 10-digit dialing is used. For example, in Montreal, Quebec, where area codes 514, 438, and 450 are currently in use, users dial 10-digit number (ex 514 555 1234), dialing a 1 before this results in a recording advising not to dial a 1 as it is a local call. For non-geographic numbers, as well as mobile telephones outside of the North American Numbering Plan area, the "area code" does not correlate to a particular geographic area. Area codes are often quoted including the national access code, for example a number in London: 020 8765 4321. Users must then correctly interpret the "020" as the code for London. If calling from another number in London they merely dial 8765 4321, or if dialing from another country, drop the "0" and dial: +44 20 8765 4321. Area codes were introduced in the United States by the Bell System, in 1947. The first direct dial long distance call occurred in 1951.  http://en.wikipedia.org/wiki/Area_codes

Albuquerque NM 505 | Addison TX 972 | Atlanta GA 404 | Anaheim CA 714 | Arlington TX 817 | Austin TX 512 | Bakersfield CA 661 | Baltimore MD 410 | Baton Rouge LA 225 | Birmingham AL 205 | Boston MA 617 |  Carson City NV 775 | Carrollton TX 972 | Cedar Rapids IA 319 | Cincinnati OH 513 | Coral Springs FL 954 | Cleveland OH 216 | Charlotte NC 704 | Dallas TX 214 | Denver CO 303 | Des Moines IA 505 | Eugene OR 541 | Fort Collins CO 970 | Fort Lauderdale FL 954 | Forth Worth TX 817 | Hartford CT 860 | Henderson NV 702 | Houston TX 713 | Irving TX 972 | Jacksonville FL 904 | Kansas City MO 816 | Katy TX 281 | Kingwood TX 281 | Las Vegas NV 702 | Little Rock AR 501 |
| Los Angeles CA 323 | Mesquite TX 972 | Memphis TN 901 | Miami FL 305 | Milwaukee WI 414 | Modesto CA 209 |
| Nashville TN 615 | Newark NJ 973 | Oakland CA 510 | Oklahoma City OK 405 | Omaha NE 402 |  Philadelphia PA 215 | Phoenix AZ 602 |
| Pittsburgh PA 412 | Plano TX 972 | Portland OR 503 | Reno NV 775 | Rochester NY 585 |
| Rockville MD 301 | Sacramento CA 916 | Salt Lake City UT 801 | San Antonio TX 210 | San Diego CA 619 | Savannah GA 912 |
| Scottsdale AZ 480 | Seattle WA 206 | Shreveport LA 318 | Spokane WA 509 | Tacoma WA 253 | Tampa FL 813 | Tempe AZ 480 |
| Texas Medial Center 713 | Tulsa OK 918 | Tucson AZ 520 | Woodlands TX 281 | answering messaging phone services |
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