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VoLTE Voice Call Service

Not even a second more -  VoLTE service.  A new era of mobile communications dawned first in Hong Kong
What is VoLTE?

csl is proud to present you VoLTE, which brings voice call and video call to a brand new generation! VoLTE (Voice Over LTE) means connection of voice and video call through 4G LTE network. As a valuable csl customer, you can now enjoy a FREE upgrade to experience voice call with speedy connection and video call with high quality!

Benefit of using VoLTE
Bebefit 1 - One second call connection

Establish significantly faster voice-call connections. Making a traditional 3G call connections takes an average of around 7 seconds but can be done in 1 second with VoLTE.

 
Benefit 2 - Better voice qualtiy

With our broad network coverage, voice quality is much enhanced using VoLTE

 
Benefit 3 - Simultaneous voice and high speed data usage

Continue to enjoy using data for other functions such as browsing or downloading an app while on a call, which is handy for multi-tasking.

 
Benefit 4 - Seamless switching between VoLTE and VoWiFi

VoLTE also offers the ability to seamlessly switch between LTE and Wi-Fi Calling, without the call cutting out.
Bebefit 5 - Video call quality 12 times better

Ensures high-definition quality video calling (applicable to some Android handsets only). Under VoLTE connection, the visual quality is clear without any grids, its resolution reaches up to 640 x 480 pixels, while for traditional video call connected via 3G network, the resolution is just 176 x 144 pixels.
Benefit 6 - Seamless switching between voice and video calls with better battery life

Enjoy instant switching between voice and video calls (applicable to some Android handsets only) with one click. Avoid the need to wait for network switching from 3G to 4G and better life is usually improved.

 



Must-have items for using VoLTE:

1. Use a handset that supports VoLTE.
2. Ensure your handset's software is updated to the latest version. (This is applicable to Android phones. Please update the software according to the manufacturer's guidelines for settings).
3. Ensure that the VoLTE function is activated on your handset. (Below are activation examples for different mobile phone series for reference.The settings of mobile phone may vary by brand, models, and software version. If you have any questions, please refer to the user manual of your handset model or contact the handset manufacturer).

* If your phone is running iPhones (iOS 14 or later) / Samsung (Android 12 or later) / SONY (Android 13 or later) / VIVO (Android 13 or later) / Nothing Series (Android 13 or later) / Honor (Android 13 or later), VoLTE is enabled by default, no further activation is required.

iPhone (iOS 13) Samsung (Android 11) HUAWEI (Android 10) Sony (Android 12) HUAWEI (EMUI 14 & 15) Xiaomi (Android 15) LG (Android 10) ASUS (Android 15) OPPO (Android 15) motorola (Android 14)



iPhone (iOS 13)
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HUAWEI (Android 10)
img



HUAWEI (EMUI 14 & 15)
Select 「Settings」 > Select「Mobile network」 > Select「Mobile data」 >
Select「Settings
 
  Select「Mobile network
 
  Select「Mobile data
 
 
Turn On「VoLTE calls」  
Turn On「VoLTE calls
 
 



LG (Android 10)
img



OPPO (Android 15)
Select「Settings 」 > Select「Mobile network」 > Select「SIM」 >
Select「Settings
 
  Select「Mobile network
 
  Select「SIM
 
 
Turn On「VoLTE calls」  
Turn On「VoLTE calls
 
 



Samsung (Android 11)
img



Sony (Android 12)
img




Xiaomi (Android 15)
Select「Settings」 > Select「Mobile  networks」 > Select「SIM」 >
Select「Settings
 
  Select「Mobile networks
 
  Select「SIM
 
 
Turn On「VoLTE」  
Turn On「VoLTE
 
 

ASUS (Android 15)
Select「Settings」 > Select「Network & internet」 > Select「SIM card」 >
Select「Settings
 
  Select「Network & internet
 
  Select「SIM card
 
 
Select「SIM 1」 > Turn On「VoLTE」  
Select「SIM 1
 
  Turn On「VoLTE」
 
 




motorola (Android 14)
Select「Settings」 > Select「Network & internet」 > Select「SIMs & mobile network」 >
Select「Settings
 
  Select「Network & internet
 
  Select「SIMs & mobile network
 
 
Select「SIM」 > Turn On「4G Calling」  
Select「SIM
 
  Turn On「4G Calling」
 
 



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