Telephone numbers in Malaysia are regulated by the Malaysian Communications and Multimedia Commission (MCMC).

Until 2017, calls to Singapore did not require international dialling; they were made using the 02 domestic access code.

The two East Malaysian states, Sabah and Sarawak, are split into multiple area codes.

Prior to 2001, subscriber numbers were seven digits in Selangor, Kuala Lumpur and Putrajaya.

From 1999 to 2001, subscriber numbers in these areas were gradually expanded to eight digits in phases to meet new demands that resulted from the growing population in the Klang Valley.

Subscriber number length is seven- or eight-digit, depending on the mobile phone code.

Through a series of mergers, there were three major mobile phone operators: Celcom, Maxis and Digi as of 2005.

With the proliferation of new mobile virtual network operators and the exhaustion of existing codes, two new ranges 011 and 015 are made available for assignment.