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If you are looking for an internet service -
How do I switch from one ISP to another

Migration Authorisation Code (MAC) Process - Additional details

A MAC is a unique code, identifying a particular line

The code consists of four letters always beginning with L followed by between seven and nine numbers, a slash, and five alphanumeric characters (e.g. LAEM1234567/1F6HT)

Where the MAC process does apply (and your new ‘gaining’ provider will advise you), the process to switch works as follows:

You must first contact your existing service provider and ask them for a MAC. They have an obligation to give you one. You should not ask for your service to be stopped;

Your existing service provider must provide the MAC to you within five working days. The MAC is valid for a period of 30 days from the date it is issued;

You should then present the MAC to your new ‘gaining’ provider of your choice that you want to switch to. Your gaining provider will then process the request to migrate and inform you of the transfer date;

If you are having problems switching between ISPs because of problems obtaining a MAC from your existing supplier, please see http://www.ofcom.org.uk/complain/internet/switching/