VoLTE Voice Call Service

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!

In 2017, csl has joined forces with Macau mobile service provider CTM to launch the world’s first end-to-end VoLTE IDD service, so both sets of customers can enjoy high-quality voice and video IDD calling, plus near-instant connection.

Benefit of using VoLTE

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.

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

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.

VoLTE also offers the ability to seamlessly switch between LTE and Wi-Fi Calling, without the call cutting out.

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.

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.

(1)  Facilitates faster voice-call connections. What used to take around 7 seconds on a 3G network is now as fast as 1 second, if both parties are using VoLTE.  Even so it just takes around 4 seconds if using 3G network.

(6)Click the “Video Call” icon/button during a VoLTE call to switch between voice and video calls – instantly, simply and quickly(applicable only to some Android models).

Must-have items for using VoLTE:

• Use a handset that supports VoLTE
• 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.)
• Activate the VoLTE function on handset.
  (Below are activation examples for different mobile phone series for reference. If the iPhone is IOS14 or later / Samsung phone is Android 12 or later / SONY phone is Android 13 or later, VoLTE is enabled by default, no further activation is required)
    - iPhone (iOS13)
    - Huawei (Android 9)
    - Huawei (Android 10)
    - LG (Android 9)
    - LG (Android 10)
    - OPPO (Android 12)
    - Samsung (Android 9 & 10)
    - Samsung (Android 11)
    - Sony (Android 9)
    - Sony (Android 10 & 11)
    - Sony (Android 12)
    - Xiaomi (Android 10)
    - Xiaomi (Android 11 & 12)

Handset supporting VoLTE:

Remarks

• VoLTE service is only available under 4G LTE network coverage for intra-network calls or inter-network call between CTM Macau, with designated rate plans and handsets, and cannot be used in conjunction with certain types of service. Please call 25 123 123 for details. 
• Video call is a chargeable service, irrespective of whether 3G or VoLTE has been activated. The standard charge of local video call: intra network – $1.5/min; other local operator – $2.5/min. Usage will be rounded up to the nearest minute. Customer in Hong Kong makes voice or video calls to CTM Macau numbers or makes IDD voice or video calls in Macau  are subject to extra IDD charges.
• VoLTE Video call is only available when both users are using VoLTE service.