Companhia de Telecomunicações de Macau, S.A.R.L. (commonly known as CTM) is a mobile network operator in Macao, China assigned PLMN code 455-01 by the national telecommunications authority.

The MCC 455 identifies Macao, China, while MNC 01 uniquely identifies this operator within the country. Together they form the PLMN (Public Land Mobile Network) identifier used by mobile devices for network selection, SIM card identification, and international roaming.

This assignment was last reported in ITU Operational Bulletin #1280 (Nov. 15, 2023). Search all MCC/MNC codes or view all Macao, China operators .