Visitors to HK |  Customer Care |   |  Club SIM |  Online Shop (Connection/Renewal) |  My HKT | 
中文 ENG
Home  >   Infotainment   >   Communication   >   Call Filtering Service

Call Filtering Service

Take control of your incoming calls with hassle free user experience!

Call Filtering empowers you to block unwanted calls and allows only certain callers to get through.


  • Block spam calls/prevent deception calls
  • Establish a Spam Call List to block unwanted calls, based on network-generated statistics.

  • Higher security/prevent privacy breaches
  • Customer’s contact list or other personal data is never accessed as part of our security process.

  • Customize your own black/white lists
  • Create your own “My Do-Not-Disturb List” and “Authorized List” to block, or authorize, incoming calls.

  • Ad-free
  • Advertisements are never displayed

  • Highly compatible
  • Works on all handsets, including smartphones and feature phones. Compatible with multiple platforms using a sync-to-the-cloud setting. The experience remains constant across different devices.

Main Functions:

  • Block Anonymous Calls
  • You can reject calls displaying unknown phone numbers by using the “Block Anonymous Calls” feature. When a blocked number calls, your phone will not ring. The rejected call is connected to an announcement advising you no longer wish to receive anonymous calls.

  • My Do-not-Disturb List
  • Ban up to 200 numbers and block unwanted calls from specific phone numbers. Such callers are immediately connected to a “the called party is unreachable” announcement.

  • Authorized/VIP List
  • Alternatively, you can identify up to 200 phone numbers you want to receive calls from, thereby diverting calls from all other numbers to voicemail. If you include an “Authorized List” number in the “VIP List”, calls from that number will not be blocked, even when the caller chooses not to display his/her phone number.

1. Via Call Manager from csl service manager app >Call Manager > Call Filtering

2. Via your handset press the Short Code

Short Code§
To turn on/off the Block Anonymous Calls service
* 136 #  
To turn on/off the My Do-not-Disturb List
* 136 * 1 #
To add the last answered call to My Do-Not-Disturb List+
* 136 * 1 * #
To add numbers to My Do-Not-Disturb List
* 136 * 1 * xxxxxx #
To delete number from My Do-Not-Disturb List
* 136 * 1 # xxxxxx #
To delete all numbers from My Do-Not-Disturb List
* 136 * 1 # * #
To turn on/off the Authorized List
* 136 * 0 #
To add numbers to Authorized List
* 136 * 0 * xxxxxx #
To delete number from Authorized List ]
* 136 * 0 # xxxxxx #
To delete all numbers from Authorized List
* 136 * 9 #

+ Not applicable for answered call without Caller Number Display and International N
§ Short Code not applicable to Home broadband service.

3. Via Website

My Account My Setting Call Filtering Service

4. Via

PIM Call Filtering Service

How To Sign Up?

。csl shop
。Customer Service Hotline at 25 123 123


How Much To Pay?

Monthly Charge

Service Monthly Fee Minimum Contract Period
Call Filtering Service $18 12 months
$22 Monthly

*Terms and Conditions apply

Call Filtering Service Terms and Conditions:

1 By using Call Filtering ("the Service"), you understand and agree to these terms and conditions.
You may subscribe to the Service:
(a) on a monthly basis; or
(b) for a Minimum Contract Period of 12 months. If you terminate the Service after the first two (2) months and before the expiry of the Minimum Contract Period, you must pay the monthly fee of the Service for the remaining months of the Minimum Contract Period to us immediately.
3 Out of area calls, long distance calls, calls originating from public paid phone and Private Automatic Branch Exchange (PABX) cannot be blocked by the Service.
4 Only eight digit Hong Kong phone numbers can be added to My Do-not-Disturb numbers and Authorized numbers.
5 Default Do-Not-Disturb numbers may be updated or changed from time to time without prior notice and are provided by third parties, and we are not responsible or liable for the quality, nature, accuracy and usefulness of these numbers.
6 We reserve the right to modify or cancel the Service (or any part thereof) and/or any features of the Service at any time without prior notice. You agree that we will not be liable to you or any third party for any modification or cessation of the Service and/or its features.
We make no warranty that:
(a) the Service will meet your requirements;
(b) the Service will be uninterrupted, timely, secure or error-free;
(c) the results or information that may be obtained from the use of the Service will be accurate or reliable;
(d) the quality of any services, information or other material obtained by you through the Service will meet your expectation.
8 You expressly understand and agree that your use of the Service is at your sole risk, and the Service is provided on an “AS-IS” and “AS AVAILABLE” basis and we expressly disclaim all warranties of any kind, whether express or implied, including, but not limited to merchantability, fitness for a particular purpose and non-infringement. We assume no responsibility for the timeliness, deletion, mis-delivery or failure to store any user communications or personalization settings or for any damage to your Mobile Equipment or loss of data that results from the download of any materials, data or information. You expressly relieve us from any and all liabilities arising from the access or use of the Service (or any part thereof).
9 The Service is also subject to the terms and conditions of the Mobile Service Agreement and the terms and conditions of any third party suppliers as may be amended from time to time.
10 We reserve the right to change or terminate the Service and these terms and conditions at any time without prior notice. All matters and disputes will be subject to our final decision.

General Terms & Conditions of   |    Privacy Statement   |    csl Fair Use Policy   |    Regulatory Notices   |    General Terms & Conditions   |    Special Conditions   |    QoS Measures   |    Industry Code of Practice/Scheme   |    Careers
CSL Mobile Limited 香港移動通訊有限公司 2018 All Rights Reserved.The website is optimized for Internet Explorer 7 or above, and is best view with screen resolution of 1024x768.
Online Shop (Connection/Renewal)
The Club
Club SIM
Data Usage Calculator
Smartphone Workshop
Smartphone Encyclopedia
csl Facebook Page
csl YouTube Channel
csl Instagram