UK Area Code Finder
Quick and easy telephone dialling code information
In the UK, an 01142 number is a normal landline phone number within the Sheffield (0114) area code.
Any UK number beginning with 0114 is a Sheffield number. The '0114' area code at the beginning is optional if you're dialling from one Sheffield 0114 landline phone to another.
There is no 01142 area code. Since the year 1995, Sheffield has had the four-digit area code 0114, followed by seven-digit local numbers.
The correct way to write a number beginning '01142' is
During the year 1995, Sheffield's area code changed from 0742 to 0114, while its old six-digit local phone numbers were prefixed with '2' to make them seven digits long.
The new system gives Sheffield nearly 8 million numbers: