The code 091 merged Durham (formerly 0385), Sunderland (formerly 0783) and Newcastle-upon-Tyne (formerly 0632) into a single area. As part of the PhONEday changes on 16th April 1995 the code became 0191. Numbers within each area can be identified by the first digit of the number after the code as shown below. Calls between these two areas (except numbers beginning 0 or 1) can be made without using the code.
Numbers |
Area |
| 0XX XXXX | Newcastle-upon-Tyne |
| 1XX XXXX | Newcastle-upon-Tyne |
| 2XX XXXX | Newcastle-upon-Tyne |
| 3XX XXXX | Durham |
| 4XX XXXX | Newcastle-upon-Tyne |
| 5XX XXXX | Sunderland |
| 6XX XXXX | Newcastle-upon-Tyne |
| 7XX XXXX | Sunderland |
| 8XX XXXX | Newcastle-upon-Tyne |
| 9XX XXXX | Durham |