CSL Mobile Limited

CSL Mobile Limited, also known as CSL, a privately owned company headquartered in Hong Kong, operates as a tier 1 media tech buyer. As a wholly-owned subsidiary of HKT (a major arm of the PCCW Group), the company holds the distinction of being the territory's first mobile communications operator, established in 1983. CSL functions as a telecommunications operator in Hong Kong, providing services under the consumer brands csl, 1O1O, and Club SIM, and has launched Hong Kong's first dual-band 4G LTE network and one of its initial 5G networks, with current 5G coverage exceeding 99% of the population.