The Lisburn telephone exchange code refers to the former 01846 area code, which until the 2000 Big Number Change, served Lisburn, Aghalee, Moira, Hillsborough, Dromore, Maze, Stoneyford and Baillies Mills, all of which are in Northern Ireland, a constituent part of the United Kingdom. This area gained 92 and changed to eight digit numbers, under the new 028 area code. Before STD Before STD (Subscriber Trunk Dialling) codes were introduced in Northern Ireland, during the 1960s and 1970s, an operator based system was in operation. Each subscriber had short (usually 3 or 4 digit) number within the local exchange. For example, the post office in Dromore was Dromore 201. 0846 and 08462 When STD was introduced to the area in the early 1970s, the local towns and villages around Lisburn all scrapped their three digit numbers (with the exception of Stoneyford) and added an extra three digits. These towns used 0846 + six digits. Moira took 611, therefore Moira 369 became 611369. Maze took 621, therefore Maze 249 became 621249. Baillies Mills took 638, therefore Baillies Mills 775 became 638775. Aghalee took 651, therefore Aghalee 276 became 651276. Hillsborough took 682, therefore Hillsborough 477 became 682477. Dromore took 692, therefore Dromore 201 became 692201. Dialling a number any of the aforementioned exchanges, from another area code was achieved by simply using (0846) xxxxxx. However Lisburn, which already had four and five digit numbers, used the code 084 62. To call Lisburn 2201/Lisburn 77712 from another area code (outside 0846), one dialled (084 62) 2201/(084 62) 77712. 1989 changes In 1989, numbers in Lisburn town were adjusted to bring them into line with the surrounding area. Four digit numbers gained 66, therefore Lisburn 2201 became 662201 Five digit numbers, commencing with '7', gained 6, therefore Lisburn 77712 became 677712. Five digit numbers, commencing with '8', lost the first digit and gained 60 in its place. Lisburn 81114 became 601114. This meant that Lisburn town could use the 0846 code. 1993 changes In 1993, many changes were made throughout the country in preparation for phONE day in 1995. Many of the changes were eliminating 3-digit and 4-digit subscriber numbers in rural exchanges. The only exchange affected in the 0846 area was Stoneyford. It had 3 and 4 digit numbers and used the area code 084 664. Three digit numbers would gain 648, so Stoneyford 299 became 648299. Four digit numbers would gain