The Big Number Change was the name given to the update of dialling codes in the U.K. in response to the rapid late 1990s growth of telecommunications and impending exhaustion of numbers.

• “号码大变动”用来指代英国的电话区号为适应1990年代后电信服务量的急速增长，和号码资源即将被耗尽而采取的升级措施。