Local number portabilitywikipedia
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 change the type of service ("service portability").
local number portabilitynumber portabilityportedportUK number portability schemeare portablelocaltelephone number portingWireless number portabilityported between landline and mobile

Signalling System No. 7

SS7SS7 networkCCS7
Providers use SS7 to route calls throughout the US/Canada network.
It also performs number translation, local number portability, prepaid billing, Short Message Service (SMS), and other mass market services.

Location Routing Number

The routing information necessary to complete these calls is known as a Location Routing Number (LRN).
The assignment of a location routing number to telephone numbers allows for local number portability.

Telephone number

telephone numberphone numbertelephone numbers
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 change the type of service ("service portability").
Local number portability (LNP) allows a subscriber to request moving an existing telephone number to another telephone service provider.

Voice over IP

VoIPvoice over IPvoice over Internet Protocol
The same is not true of mobile telephones, which are fully portable to another carrier or another service type (such as landline or voice over IP) within the same local interconnection region.
Local number portability (LNP) and Mobile number portability (MNP) also impact VoIP business.

Number Portability Administration Center

LNP was first implemented in the U.S. upon the establishment of the original Number Portability Administration Center (NPAC) in Chicago, Illinois in 1998.
As such, it facilitates local number portability in the United States and Canada.

North American Numbering Plan

Area codeArea codes<span style="white-space:nowrap;">Area code(s)
(The regulations are currently located at, et seq.) The North American Numbering Council (NANC) was directed to select the Local Number Portability Administrators (LNPAs), akin to the North American Numbering Plan Administrator (NANPA) which administers the North American Numbering Plan.
Number pooling was implemented with another technical obstacle, local number portability.

Local exchange carrier

local exchange carrierLEClocal exchange
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 change the type of service ("service portability").

Mobile number portability

mobile number portabilitynumber portabilitycarry their original phone number with a new provider
The same is not true of mobile telephones, which are fully portable to another carrier or another service type (such as landline or voice over IP) within the same local interconnection region. In the rest of the world it is referred to as mobile number portability (MNP).

Area code 600

area code 600600610
Numbers in the rarely used non-geographic area code 600 are not portable.
Each block of 10000 numbers is assigned to one carrier only; there is no number portability or number pooling in +1-600.

Local access and transport area

LATAlocal access and transport areaLATA code
The same is not true of mobile telephones, which are fully portable to another carrier or another service type (such as landline or voice over IP) within the same local interconnection region.
Canada does define local interconnection regions (LIR's), which determine where points of interconnection (POI) must be provided by competing local exchange and mobile carriers to provide local number portability.

Local-loop unbundling

local loop unbundlinglocal-loop unbundlingLLU
The sole of them operating statewide—Telefónica—is obliged to provide other firms with access to their exchange facilities or rental/transfer of their copper last-mile loops, at fees regulated by the CMT (practice known as local loop unbundling).

Porting Authorisation Code

PAC
In the United Kingdom, Ofcom directs fixed-line telephone network providers, mobile phone providers and broadband service providers to provide number portability under the Porting Authorisation Code rules and Migration Authorisation Code code of practice respectively.

Area code 406

406area code 406Area code
As of 2013, there were 1.7 million lines served by 47 carriers; all but two wireline providers support local number portability (the exceptions are small rural independents Hot Springs Telephone Company and Northern Telephone Cooperative).

Area codes 416, 647, and 437

416416, 647416, 647, 437
Local numbers are portable, with few limited exceptions for specific services such as pocket pagers.

Telephone numbers in the Netherlands

Dialing codeArea code+31
However, a telephone number from a block allocated to a certain provider may no longer be serviced by the original assignee due to number portability; subscribers who switch providers can take their number with them.

Toll-free number portability

toll-free number portabilitynumber portabilityported to any carrier
Similar schemes exist in many countries for local number portability and mobile number portability, although implementation details for each portability scheme varies between countries.

Rate center

rate centerrate centre
A telephone number prefix (1+6 digits) normally suffices to uniquely identify a rate center; if number pooling and local number portability were not in use, it would also uniquely identify a wire center.

Caller ID

caller IDcaller line identificationCLI
It is for this reason that mobile phone callers appear as WIRELESS CALLER, or the location where the phone number is registered (these vary based on which company owns the block of numbers, not the provider to which a number may have been ported).

Telephone numbers in Israel

+972Area codeprefix (area code)
According to the Israel Ministry of Communication a VoIP number may be ported to a landline carrier and vice versa providing the option to have, say, a northern number in the south of the country.

86th Street (Manhattan)

86th Street86th86th Street (Manhattan)
Local number portability in the early 21st century allowed transferring phone numbers to either side.

Vodafone New Zealand

VodafoneVodafone TVVodafone InHome TV
However Number portability was introduced to the New Zealand market on 2 April 2007 which means that customers can bring, for example, their 021 prefixed number to Spark or 2degrees.

EVoice

eVoice
Local telephone assigned by eVoice are not portable to another provider, despite FCC policy that clients of interconnected Voice over Internet Protocol (VoIP) providers are entitled to keep an existing phone number.

Flowroute

Flowroute's services include SIP trunking, local DIDs and toll-free numbers, outbound termination, and network services such as E911, CNAM Lookup, CNAM Storage, and local number portability.