The advent of 5G mobile Internet connectivity will see csl making the everyday lives of customers smarter and healthier, as well as more convenient and enjoyable.

HKT has acquired spectrum in the 3.3GHz, 3.5GHz, 4.9GHz and 26/28GHz frequency bands, a capability that will combine with our extensive infrastructure to get the very best out of 5G technology – all to the benefit of csl customers.

Date of acquisition
in 2019
Band Frequency acquired
March 27
High-band spectrum 26/28GHz
October 14
October 23
Mid-band spectrum
(golden band spectrum)
November 6

5G characteristics

Ultra high speed

20 times faster than maximum 4G download speeds.

Massive connectivity

The number of smart devices that can be connected simultaneously is more than 100 times greater than 4G can achieve.

Ultra-low latency

Latency of less than one-thousandth of a second.

Three major 5G frequency bands

Global and Hong Kong 5G spectrums are broadly divided into three different frequency bands – high, medium and low. Each range comes with completely different characteristics and advantages.

High-band spectrum


UHF broadband for ultra-high transmission speed.

Deployment in the environment

This is suitable for indoor and high-density environments, and provides ultra high-speed connectivity for multiple users simultaneously.

Mid-band spectrum
3.3GHz, 3.5GHz
and 4.9GHz


Considered 5G’s “golden band spectrum”, mid-band provides high speeds and wide coverage.

Deployment in the environment

5G service will be rolled out to many Hong Kong districts.

Low-band spectrum
2GHz and below


Very high penetrating signal power to suit Hong Kong’s proliferation of high-rise buildings.

Deployment in the environment

Use high and medium frequencies to maximize 5G coverage.

Source: Information and figures on 5G are referenced from the documents listed by GSM Association. More details can be found in

Some figures quoted are theoretical value, actual performance may vary due to location, spectrum allocated, network resource availability and the compatible handset’s capability, etc.

5G network coverage

Our truly genuine 5G network now covers outdoor areas including but not limited to Central, Sheung Wan, Causeway Bay, Mong Kok, Yau Ma Tei, Jordan, Tsim Sha Tsui, Kowloon Bay, Kwun Tong and Quarry Bay, as well as the interiors of Hong Kong International Airport and major shopping malls.

csl commands 3.3GHz, 3.5GHz and 4.9GHz 5G sections of the golden spectrum band and does not use the existing 4G band for 5G service. This means quality of the overall 4G user experience will not be compromised.

Customers simply need to use a 5G mobile device compatible with 4.9GHz to reap the extraordinary speed and other benefits of csl’s 5G network at locations such as the Hong Kong Science Park and certain areas of Tai Po and Ma On Shan.

Our 5G network was also field tested by trade press publications1&2, which reported satisfactory results in and outdoors. csl’s 5G capability proved significantly faster than 4G service and performed well in large crowded shopping malls such as The Gateway Tower and K11 MUSEA.

Importantly, we will become the first mobile operator to provide seamless 5G coverage along all major MTR lines when our network is extended to more than 50 stations by mid-October. This means commuters will be able to enjoy ultra-fast 5G service on concourses and platforms, as well as inside train cars, on the following major MTR lines: Island (Central to Tai Koo), Tsuen Wan (Central to Kwai Hing), Kwun Tong (Whampoa to Yau Tong), Tseung Kwan O (North Point to Yau Tong), East Rail (Mong Kok East to Lo Wu) and Tuen Ma (Kai Tak to Ta Wai).

csl will continue extending 5G coverage throughout Hong Kong, in step with launch of new 5G smartphones this year, while making the many wonders of this amazing new mobile broadband technology readily available to customers.

1. PCM