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"). In most cases, there are limitations to transferability with regards to geography, service area coverage, and technology. Location Portability and Service Portability are not consistently defined or deployed in the telecommunication industry.