<P> The code for Northern Ireland is (028). The transition codes for Northern Ireland are shown below . These can be accessed from the Republic of Ireland using either the domestic code 048, or the international prefix 00 44 28 . </P> <P> The prefixes for existing numbers in Northern Ireland are split up into seven groups, roughly based upon the county in which the main exchange is based . The initial digit of each phone number is based on the designated county--for example, the first county alphabetically is County Antrim so numbers in this county start with 2 . The next county is County Armagh so numbers here start with 3 . One exception to this is the Greater Belfast area, initial digit 9, which is extended to include each adjacent former STD code area, including the towns of Bangor, (County Down) (91), Lisburn (92), Carrickfergus (93), Antrim (94) and Saintfield (97). The encompassed former STD codes at some points extend to over 20 miles from Belfast itself . There is a much more complete list in the Big Number Change article . </P> <Table> <Tr> <Th> Town / city </Th> <Th> Region </Th> <Th> New numbering </Th> <Th> Old numbering </Th> </Tr> <Tr> <Td> Larne </Td> <Td> County Antrim </Td> <Td> (028) 28xx xxxx </Td> <Td> (01574) xxxxxx </Td> </Tr> <Tr> <Td> Armagh </Td> <Td> County Armagh </Td> <Td> (028) 37xx xxxx </Td> <Td> (01861) xxxxxx </Td> </Tr> <Tr> <Td> Newcastle </Td> <Td> County Down </Td> <Td> (028) 437x xxxx </Td> <Td> (013967) xxxxx </Td> </Tr> <Tr> <Td> Enniskillen </Td> <Td> County Fermanagh </Td> <Td> (028) 66xx xxxx </Td> <Td> (01365) xxxxxx </Td> </Tr> <Tr> <Td> Limavady </Td> <Td> County Londonderry </Td> <Td> (028) 777x xxxx </Td> <Td> (015047) xxxxx </Td> </Tr> <Tr> <Td> Omagh </Td> <Td> County Tyrone </Td> <Td> (028) 82xx xxxx </Td> <Td> (01662) xxxxxx </Td> </Tr> <Tr> <Td> Belfast </Td> <Td> Greater Belfast </Td> <Td> (028) 90xx xxxx </Td> <Td> (01232) xxxxxx </Td> </Tr> <Tr> <Td> Lisburn </Td> <Td> Greater Belfast </Td> <Td> (028) 92xx xxxx </Td> <Td> (01846) xxxxxx </Td> </Tr> </Table> <Tr> <Th> Town / city </Th> <Th> Region </Th> <Th> New numbering </Th> <Th> Old numbering </Th> </Tr>

When an area code changes the phone number for a given customer before the change