Prior to the Big Number Change on 22 April 2000 the area had shorter, six-digit local numbers with an area code of 01222. This was 0222 before May 1995, derived from 0 (indicating it was a trunk call) 22 (CA on a telephone pad, for CArdiff) and 2 (as 220 was used for CAmbridge and 221 for BAth). Before the introduction of automated trunk call dialling, non-local numbers were accessed through a system of manual telephone exchanges, in common with rest if the United Kingdom.