Number Portability is the facility which enables customers to retain their telephone number independently of the operator providing the service. All operators are obliged to provide number portability as a customer right under the Universal Service Regulations (SI308/2003). Number portability enables customers to choose to move between operators, where they may get a better deal on tariffs or services with another operator, without incurring the additional cost and inconvenience of a number change. There are three different types of number portability; Geographic, Non-geographic and Mobile.

• Geographic Number Portability

GNP enables any fixed line customer to move or port their telephone number(s) to any other available operator.

• Non - Geographic Number Portability

NGNP enables customers to transfer their non-geographic number service (e.g. freephone, lo-call, VoIP numbers between host providers.

• Mobile Number Portability

MNP enables mobile customers to retain their mobile number when moving between mobile telephony operators.