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

Call Filtering empowers you to block spam calls and allows only certain callers to get through.
Features
Block spam calls / prevent deception calls
Network based system to detect, analyze and filter the spam calls before they can reach you thus keep you free from nuisance.
Higher security / prevent privacy breaches
Customer's contact list is never accessed as part of our security process.
Customize your own black/white lists "Personal Blacklist" / "Personal Whitelist"
Enjoy more flexibility and control with your "Personal Blacklist" and "Personal Whitelist".
"Personal Whitelist" allows only selected phone numbers to reach you. In addition, if you want to receive any specific spam call for some reasons, you can add the caller to the whitelist.
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.
Protecting you from overseas spam calls
"Incoming Overseas Call Alert Service",
"Overseas Calls Filtering Service" and
"Suspected Overseas Call Filtering Service" have been added to “Call Filtering Service”, all to protect you from overseas spam calls.
Main Functions
Block Anonymous Calls
You can reject calls with no caller ID by using the “Block Anonymous Calls” feature. When an anonymous number calls, your phone will not ring. The rejected call is connected to an announcement advising you no longer wish to receive anonymous calls.
 
Personal Blacklist
Create your own "Personal Blacklist" (max. 200) to block selected phone numbers. Such callers are immediately connected to a “the called party is unreachable” announcement.
 
Personal Whitelist / VIP List
You can create your own "Personal Whitelist" (max. 200) if you want to receive calls from selected phone numbers. All other calls will be diverted to voicemail. If you want to let specific spam calls to reach you, you can add these numbers to the Personal Whitelist as well. If you add a "Personal Whitelist" number to the "VIP List", calls from that number will not be blocked, even when the caller chooses not to display his/her phone number.
 
Incoming Overseas Call Alert Service
“Overseas Incoming Call Alert” identifies calls from outside Hong Kong.
Answering a call from overseas triggers the announcement:
“Please be aware this is an overseas call.”

 
Overseas Calls Filtering Service
“Filter All Overseas Calls” blocks all calls from outside Hong Kong.
The system blocks all calls from outside Hong Kong, except those on your Personal Whitelist.

 
Suspected Overseas Call Filtering Service
“Filter Suspected Overseas Calls” blocks all calls deemed suspected.
The system blocks all calls from suspected overseas call list, except those on your Personal Whitelist.
If you need to block all calls originating from outside Hong Kong, please turn-on the “Filter All Overseas Calls” function.
Suspected overseas call list:
+53 (Cuba), +213 (Algeria), +220 (Gambia), +256 (Uganda), +674 (Nauru), +676 (Tonga), +678 (Vanuatu), +685 (Samoa) and +881 (Global Mobile Satellite System),+8521(Originating from overseas), +8522(Originating from overseas), +8523(Originating from overseas)
*The above list is subject to change from time to time without prior notice.
How to use
Upon successful service subscription
1. Manage Call Filtering Service via 1O1O Service App
 

Download 1O1O Service App
Select “My Page” after log in
Select “Call Filtering Service”
 

Check Filtered Calls

Personal Blacklist

 

Personal Whitelist

VIP List

 

Overseas Incoming Call Alert

Filter All Overseas Calls

 

Filter Suspected Overseas Calls

 
 
2. Via your handset press the Short Code
Function
To turn on/off the Filter Spam Calls
* 136 * 2 #
To turn on/off the Filter Anonymous Calls
* 136 #
To turn on/off the Filter All Overseas Calls
* 136 * 3 #
To turn on/off the Overseas Incoming Call Alert
* 136 * 4 #
Set Alert Language to English
* 136 * 4 * 1 #
Set Alert Language to Cantonese
* 136 * 4 * 2 #
Set Alert Language to Mandarin
* 136 * 4 * 3 #
To turn on/off the Filter Suspected Overseas Calls
* 136 * 5 #
To turn on/off the Personal Blacklist
* 136 * 1 #
To add the last answered call to Personal Blacklist+
* 136 * 1 * #
To add numbers to Personal Blacklist
* 136 * 1 * XXXXXX #
To delete number from Personal Blacklist
* 136 * 1 # XXXXXX #
To delete all numbers from Personal Blacklist
* 136 * 1 # * #
To turn on/off the Personal Whitelist
* 136 * 0 #
To add numbers to Personal Whitelist
* 136 * 0 * XXXXXX #
To delete number from Personal Whitelist
* 136 * 0 # XXXXXX #
To delete all numbers from Personal Whitelist
* 136 * 0 # * #

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

How To Sign Up?
  • 1O1O shop
  • Customer Service Hotline at 2888 1010
  • 1O1O Service App
 

Download 1O1O Service App
Select “My Page” after log in
Select “Call Filtering Service”
Select and subscribe the
Call Filtering Service you need
 
How Much To Pay?

Monthly Charge

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

*Terms and Conditions apply

Terms & Conditions

Call Filtering and Overseas Call Alert Service Terms & Conditions:

  1. Service details:
    1. By using Call Filtering and Overseas Call Alert Service ("the Service"), you confirm to have read, understood and agreed to these Terms & Conditions.
    2. The Service comprises of four major features
      1. Spam Call Filtering Service
      2. Overseas Call Filtering Service
      3. Suspected Overseas Call Filtering Service
      4. Incoming Overseas Call Alert Service
    3. You may subscribe to the Service:
      1. on a monthly basis; or
      2. for a Minimum Commitment Period of 12 months. If you terminate the Service prior to the expiry of the Minimum Commitment Period, you must pay the early termination charge to CSL Mobile Limited (“the Company”, “we”, “our”, “us”) immediately. It is the sum of the monthly fee of the Service for the remaining months of the Minimum Commitment Period.
  2. The Spam Call Filtering Service:-
    1. The Spam Call Filtering Service is automatically turned on upon your subscription to the Service. You can turn off Spam Call Filtering Service anytime.
    2. When the Spam Call Filtering Service is turned on, you agree the Company to block all those numbers on the spam call list which is defined by the Company’s call filtering platform and third parties’ intelligence and may be updated or changed from time to time without prior notice. We are not responsible or liable for the quality, nature, accuracy and usefulness of the Service.
    3. Out of area calls, calls originating from public paid phone and Private Automatic Branch Exchange (PABX) cannot be blocked by the Service.
    4. Long distance calls, cannot be blocked by the Service, except you have turned on the Overseas Call Filtering Service and the Suspected Overseas Call Filtering Service.
    5. Unless you have turned on the Overseas Call Filtering Service and Suspected Overseas Call Filtering Service, the Service can accept eight-digit Hong Kong phone numbers only. You can add the number to your personal blacklist (maximum of 200 entries) and personal whitelist (maximum of 200 entries).
    6. After subscribing to the Service, you can submit numbers to be included in the spam call list and you agree to grant us the right to:
      1. Share the call numbers submitted by you with third parties for verification at their intelligence;
      2. to add or delete the call numbers submitted by you to or from the spam call list at any time, without notice for any reason whatsoever;
      3. share the spam call numbers to all the subscribers of the Service.
    7. The Company is not responsible of any disputes between you and the owner of phone numbers in the spam call list that are submitted by you.
    8. If you want to receive any specific number on the spam call list, you may add the number to the personal whitelist.
  3. The Overseas Call Filtering Service:
    1. When the Overseas Call Filtering Service is turned on, you agree the Company to block all calls originating outside Hong Kong with a “+” sign in the caller identity display except those in your whitelist.
  4. The Suspected Overseas Call Filtering Service:
    1. The Suspected Overseas Call Filtering Service is automatically turned upon your subscription to the Service. You can turn off Overseas Call Filtering Service anytime.
    2. When the Suspected Overseas Call Filtering Service is turned on, you agree the Company to block all calls originating from certain countries except those in your whitelist. The list of suspected overseas calls may be updated from time to time, for details, please see https://www.hkcsl.com/en/call-filtering-service/.
  5. Incoming Overseas Call Alert Service:
    1. The Incoming Overseas Call Alert Service is automatically turned upon your subscription to the Service. You can turn off Incoming Overseas Call Alert Service anytime.
    2. When the Incoming Overseas Call Alert Service is turned on, you will hear a pre-recorded messages when you receive any originating outside Hong Kong with a “+” sign in the caller identity display.
  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 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.
  7. We make no warranty that:
    1. The Service will meet your requirements
    2. The Service will be uninterrupted, timely, secure or error-free
    3. The results or information that may be obtained from use of the Service will be accurate or reliable
    4. The quality of any services, information or other material obtained by you through the Service will meet your expectations
  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 make no warranties of any kind, whether express or implied, including, but not limited to, merchantability, fitness for a particular purpose and non-infringement. We accept 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 downloading any materials, data or information. You expressly relieve us of any and all liabilities arising from access to, or use of, the Service (or any part thereof).
  9. The Service is also subject to the Terms & Conditions of the Mobile Service Agreement and the Terms & Conditions as dictated by any third-party supplier, as may be amended periodically. In the event of inconsistency between these Terms & Conditions and the Mobile Service Agreement, these Terms & Conditions shall prevail.
  10. We reserve the right to change these Terms & Conditions at any time without notice. All matters and disputes will be subject to our final determination.