This year (yet again) British Telecom and OFTEL found it necessary to change the area codes for some of the UKs biggest cities, and those of Northern Ireland.
For your easy reference, the Northern Ireland changes are listed below, in order of county.
Antrim
Area Old Code New Code
Ballycastle 012657 028 207X XXXX
Martinstown 012667 028 217X XXXX
Ballymena 01266 028 256X XXXX
Ballymena 01266 028 25XX XXXX
Ballymoney 012656 028 276X XXXX
Larne 01574 028 28XX XXXX
Kilrea 012665 028 295X XXXX
Armagh
Area Old Code New Code
Newry 01693 028 302X XXXX
Newry 01693 028 30XX XXXX
Armagh 01861 028 37XX XXXX
Portadown 01762 028 38XX XXXX
Down
Area Old Code New Code
Banbridge 018206 028 406X XXXX
Rostrevor 016937 028 417X XXXX
Kircubbin 012477 028 427X XXXX
Newcastle 013967 028 437X XXXX
Downpatrick 01396 028 44XX XXXX
Fermanagh
Area Old Code New Code
Enniskillen 01365 028 66XX XXXX
Lisnaskea 013657 028 677X XXXX
Kesh 013656 028 686X XXXX
Londonderry
Area Old Code New Code
Coleraine 01265 028 703X XXXX
Coleraine 01265 028 70XX XXXX
Londonderry 01504 028 71XX XXXX
Limavady 015047 028 777X XXXX
Magherafelt 01648 028 796X XXXX
Magherafelt 01648 028 79XX XXXX
Tryone
Area Old Code New Code
Carrickmore 016627 028 807X XXXX
Newtownstewart 016626 028 816X XXXX
Omagh 01662 028 82XX XXXX
Ballygawley 016625 028 855X XXXX
Cookstown 016487 028 867X XXXX
Dungannon 01868 028 87XX XXXX
Fivemiletown 013655 028 895X XXXX
Belfast district
District Old Code New Code
Belfast 01232 028 90XX XXXX
Bangor 01247 028 91XX XXXX
Lisburn 01846 028 92XX XXXX
Ballyclare 01960 028 93XX XXXX
Antrim 01849 028 94XX XXXX
Saintfield 01238 028 97XX XXXX
Please see UK Area Code Changes for information on the new city codes.