Tonga Communications Corporation (commonly known as U-Call) is a mobile network operator in Tonga assigned PLMN code 539-01 by the national telecommunications authority.

The MCC 539 identifies Tonga, 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 Tonga operators .