What is mobile number portability (MNP)? Mobile number portability (MNP) is the process of transferring (porting) your mobile phone number from one mobile phone network provider to another. You may want to do this if you wish to sign up to a new mobile phone provider and keep your original mobile phone number, thus saving you the inconvenience of updating your contacts with your new telephone number. Mobile number porting is becoming increasingly popular worldwide due to the savings that can be made by switching mobile phone providers in order to get a better mobile phone tariff...