About csl.
csl. is Hong Kong's leading provider of mobile communications. The quality of our network is widely recognised both locally and globally, with esteemed international network evaluators ranking our 5G reach and games experience among the "Top 10 in the World". Embracing our vision for the future, csl. endeavours to foster the integration of a mobile way of life. Our superb, stable 5G network, comprehensive range of services and the incorporation of AI applications enable us to offer customers novel audio-visual entertainment experiences, smart-living applications, and enterprise-level solutions, thus realising the concept of "Internet of Everything". Leveraging our expertise and strategic partnerships, csl. taps the potential of 5G technology to unite the world, empowering our customers to see the world differently.
Our Core Strengths
Network
csl. operates over 3,000 base stations, with our wireless network 100% integrated with fiber optics for faster and more stable speeds. Additionally, csl. holds the most low-frequency spectrum in Hong Kong, where strong penetration enhances indoor reception stability. We continue to upgrade our 5G network, having completed 5G coverage in the Tai Lam Tunnel and progressively upgrading networks in 24 MTR stations.
Network Security
csl. places great emphasis on customer network security. All csl. customers can enjoy the free ""Call Filtering Service,"" which detects, analyzes, and automatically filters incoming calls for you! In addition, we offer a dedicated ""Anti-Scam Support"" WhatsApp hotline, free SMS instant alert service, on-site anti-scam experts at our stores, and participation in the SMS sender registration system to put an end to scam messages.
Golden Roaming
Only csl. exclusively partners with top network operators worldwide to provide golden spectrum access, complemented by comprehensive travel packages. Enjoy ultra-high-speed internet wherever you go, starting your worry-free journey.
Awards
csl.'s mobile communications services are highly acclaimed, earning 5G and brand awards from media outlets such as Hong Kong 01, Sing Tao Headlines, Hong Kong Economic Journal, am730, as well as PCM, DC Fever, and Hong Kong Discussion Forum. Recommended by authoritative sources across Hong Kong, csl. is your top choice.
AI, Lifestyle & Innovation
AI
With the rapid development of AI technology, csl. has pioneered the upgrade of all our stores to "AI Stores," curating the latest and most extensive AI products for Hong Kong customers, with AI specialists available to answer questions on the spot. At the same time, csl. exclusively provides customers with free Perplexity Pro advanced AI services. We have also established the "AI Academy," where AI instructors personally teach popular AI tools and smartphone features, helping customers effortlessly master the latest technology for a more seamless and effortless lifestyle.
>> Learn MoreExclusive Partner Offers
csl. curates exclusive dining, shopping, and entertainment deals across mainland China, Hong Kong, and Macau, offering a truly unique lifestyle experience.
>> Learn MoreEvent Highlights
Beyond delivering premium service experiences, csl. organizes various workshops and participates in major events and celebrations to bring more playful and engaging lifestyle moments to everyone.
History of csl.
Launch of "Golden Roaming" Service
csl. becomes the first telecom operator in Hong Kong to partner with nine major Asia-Pacific network operators to offer priority allocation of golden spectrum, fully enhancing the outbound roaming experience.
Partnership with Perplexity
csl. partners with Perplexity to offer the advanced AI service Perplexity Pro free of charge to selected customers.
Limited Edition Panda SIM Card
csl. launches a limited edition "Giant Panda Commemorative SIM Card" to celebrate the launch of the "Panda TV" channel (Now TV Channel 200).
Exclusive Launch of Satellite Egg
csl. exclusively launches Hong Kong's first "Satellite Egg," easily connecting to smartphones for reliable network connectivity.
New Era of AI
csl. steps into a new domain, moving from 5G to Artificial Intelligence, pioneering the AI trend.
Revamped Cross-Border Service
csl. launches the revolutionary Mainland China and Hong Kong One-Card, Two-Number Value-Added Service.
Limited Edition Rubber Duck SIM Card
csl. launches the limited edition "Double Ducks 2023 Hong Kong Commemorative SIM Card" to "swim" the world with the Rubber Duck.
Launch of 5G AI Academy
csl. is the first to launch the 5G AI Academy, working with the public to welcome the new era of AI.
csl. 5G x MIRROR Project
[5G New Standard, New Trend] Hong Kong's first csl. 5G x MIRROR project
breaks traditional limits and creates a novel 5G visual experience,
taking you into the unique MIRROR world.
Review the TV commercial starring MIRROR
Seamless 5G Network Coverage in Major MTR Lines
csl. was the first to provide seamless 5G network coverage in major MTR lines.
5G Horizon: Look Further
The 5G new era has officially arrived! csl. 5G not only boosts network
speed but also connects the world. With the Internet of Everything, you
can seize more opportunities than you imagine.
Review the TV commercial starring Jeffrey
Ngai and Mandy Tam
5G Network Activated
csl. 5G network was officially activated at 00:00 on April 1, 2020, leading Hong Kong into the new 5G era.
Big Network, Big Era Campaign
The csl. high-speed network supported the iPhone 8 (PRODUCT)RED and Apple
Watch Series 3 (GPS + Cellular), letting you fully enjoy the experience!
Review the TV commercial starring Lam
Ka-tung and Lam Suet
Launched 4.5G / 1Gbps Speed Specification
Launched 600Mbps Speed Specification
Launched 450Mbps Speed Specification
300M Maximum Speed Campaign
[Big Network, Big Era] 300M maximum speed specification, commanding the
moment of victory.
Review the TV commercial starring Dayo Wong
csl. Brand Launch
The new mobile communications brand csl. makes a momentous debut!
Contact Us
csl. specialty stores are located throughout Hong Kong, where customers can try out new devices and receive assistance from dedicated phone, AI, and anti-scam specialists to answer your questions. Follow csl. on our social media channels for the latest updates.
>> Learn More