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Long distance in telecommunications, refers to telephone calls made outside a certain area, usually characterized by an area code outside of a local call area (known in the United States as a local access and transport area or LATA). Long-distance calls usually carry long-distance charges which, within certain nations, vary between phone companies and are the subject of much competition. International calls are calls made between different countries, and usually carry much higher charges. These calls are charged to the calling party unless the called party accepts a collect call.

In the United States, long distance can refer to two different classes of calls that are not local calls. The most common class of long-distance is often called interstate long-distance, though the more accurate term is inter-LATA interstate long distance. This is the form of long-distance most commonly meant by the term, and the one for which long-distance carriers are usually chosen by telephone customers.

Another form of long-distance, increasingly relevant to more U.S. states, is known as inter-LATA intrastate long distance. This refers to a calling area outside of the customer’s LATA but within the customer's state. While technically and legally long-distance, this calling area is not necessarily served by the same carrier used for "regular" long distance, or may be provided at different rates. In some cases, customer confusion occurs as, due to rate or carrier distinctions, a local long-distance call can be billed at a higher per-minute rate than interstate long-distance calls, despite being a shorter distance.

Often, in large LATAs, there is also a class known by the oxymoronic name local long distance, which refers to calls within the customer's LATA but outside of their local calling area. This area is normally served by the customer's local telephone provider, which is usually one of the Baby Bells, despite attempts by some CLECs to compete in the local telephone market.

Callers are usually offered a variety of rate "plans" depending on usage, although which plan is cheapest for a given amount of usage is often not obvious. For example, the largest carrier, AT&T (as of February 2007) offers three plans in the United States: $30 per month for unlimited calling, $10 per month for 120 minutes plus 10 cents per minute thereafter, or $2 per month and 10 cents per minute. Graphing rate vs. usage shows that the $2 per month plan is cheapest if calling 80 minutes or less per month, the $10 per month plan is cheapest if calling 80 to 320 minutes per month, and the $30 per month plan is cheapest if calling over 320 minutes per month. Smaller companies including MCI Inc and Pioneer Telephone may offer plans in similar variety at different prices. Some of these plans can be found on sites like PhoneDog that compare a variety of long distance phone and phone card options, giving consumers useful and timely information.

While there have traditionally existed long-distance carriers who provided only long-distance services, today most if not all of the Baby Bells can offer service for all long-distance classes as well as local service, competing with the long-distance carriers. While the benefit of this arrangement is simplicity of billing and support for the customer, long-distance carriers can often offer lower rates or money-saving service plans.

Major long-distance carriers in the US include Sprint, (former) MCI Worldcom, Pioneer Telephone and AT&T. The market security for landline long-distance has been affected negatively by the common trend in with many smaller less known carriers. These would include providers such as Pioneer Telephone, Primus and Power Net Global. These organizations usually provide specialty deep discounted long distance calling plans.

• LEC - Local Exchange Carrier
• CLEC - Competitive Local Exchange Carrier
• PIC - Preferred Interexchange Carrier
• PIC Freeze - A customer's arrangement with the local exchange carrier (local telephone company) to prevent unauthorized changing of their long distance telephone carrier (oral or written). This prevents slamming. This feature is free of charge and many customers don't know they have it, which may cause a new long distance order to be delayed up to several weeks. If you do have a PIC freeze on your line, you must remove it before submitting the long distance order.
• Telephone slamming - The illegal practice of changing a consumer's telephone service - local (intralata), toll (interlata intra-state), long distance (interlata inter-state), or international - without permission.

AT&T built an interconnected long-distance telephone network, which reached from New York to Chicago in 1892, the technological limit for the wiring used. Users often did not use their own phone for such connections, but made an appointment to use a special long-distance telephone booth equipped with 4-wire telephones and other advanced technology. The invention of loading coils extended the range to Denver in 1911, again reaching a technological limit. A major research venture and contest led to the development of the audion, which provided the means for telephone signals to reach from coast to coast, which was made possible in 1914, but not showcased until the Panama-Pacific Exposition in 1915. At this time, long distance calling was performed via manual patching by a series of operators in the route of the call; connecting a coast-to-coast call in this way could take up to 23 minutes.

The first customer-connected long-distance telephone call was made on November 11, 1951 when Mayor M. Leslie Downing of Englewood, New Jersey called Mayor Frank Osborne of Alameda, California using AT&T's Direct Distance Dialing feature. This was the first call dialed with an area code, using what would now be called 10-digit dialing, and was connected automatically within 18 seconds.^[1] In addition to area codes, this development also came with the introduction of a national 7-digit standard for local number length.

Until the early 1980s, a called party could instantly recognize an incoming Long Distance call by its hiss and/or low level, due to the inherent signal loss and introduction of noise common with all-analog long-distance telecommunications circuits of the era. The introduction of digital technology such as T-carrier circuits by AT&T starting in 1961 (and adopted by their long distance networks on a larger scale starting in the early-to-mid 1970s) let long distance calls approach the high voice quality of local calls.

• AT&T Long Lines
• Long-haul communications
• Trunk vs Toll

• First Transcontinental Telephone Call
• First Direct-Dial Transcontinental Telephone Call
• Slamming Reference
• 1922 Britannica supplement