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A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence.
Call forwarding typically can redirect incoming calls to any other domestic telephone number, but the owner of the forwarded line must pay any toll charges for forwarded calls. Call forwarding is often enabled by dialing *72 followed by the telephone number to which calls should be forwarded. Once someone answers, call forwarding is in effect.
Local number portability (LNP) for fixed lines, and full mobile number portability (FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider portability"), move it to another location ("geographic portability"), or ...
To activate Remote Access to Call Forwarding, a subscriber calls a provider-supplied Remote Access Directory Number, enters the telephone number of the line to be redirected along with a personal identification number (PIN), a vertical service code (such as 72# or *73) and the number to which the calls are to be forwarded.
This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.
Most vertical service codes are activated with #, * or a leading 11- and are internal to an individual landline or wireless carrier. This block mostly contains codes to activate or deactivate features such as call forwarding, but rarely a test number may appear in this set. 515: 552# Des Moines Metro Area (CLEC), Iowa
10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by MCI, which is now part of Verizon.
Code 959 with three or four additional digits is dedicated for access to office test lines in local exchange carrier and interoffice carrier central offices. The specifications define several test features for line conditions, such as quiet line and busy line, and test tones transmitted to callers.