Caller Alert




Singtel Caller Alert - Goodbye to Missed Calls!


No Image

There’s no need to worry about missing important calls when your phone is turned off or when the battery is flat. Singtel Caller Alert will help you keep track of all your missed calls.

With Singtel Caller Alert, you can now enjoy these benefits:

  • Never miss any important calls again
  • Keep a record of local and overseas calls
  • No registration required, and no subscription fees*
  • FREE SMS alert or notification


* Singtel Caller Alert is free to all Singtel mobile GSM 900 customers. This service is not available to subscribers with Voicemail, Number Portability (to other service providers), Data and GPRS main lines.

Frequently Asked Questions


Using Caller Alert



  1. What is Caller Alert?

    Caller Alert is a free service brought to you by Singtel Mobile. It aims to assist our customers (On GSM 900 & 3G networks) in managing their incoming calls. It is designed for mobile users who do not want to miss any important or urgent calls because

    • their mobile phone is switched off* e.g. during important meetings
    • their mobile phone battery is flat*
    • they are out of mobile network coverage in certain remote areas


    Caller Alert is not applicable for customers with VoiceMail / Mobile No-Miss / OneMail / OneNumber / Duoline / Number Portability (to other service providers) / Data and GPRS main line. 
    * Including when overseas.

  2. How does it work? 
    • Caller dials your mobile phone number
    • Your mobile number is in unreachable mode (Mobile phone is switched off, phone battery is flat or no mobile network coverage in certain remote areas)
    • The caller will hear an IVR prompt, informing him that his calling number will be sent to the recipient. However, caller with Caller-Number-Non-Display will have the option not to send his calling number.
    • A notification message (SMS)* is then sent to you. This notification SMS will be delivered to you as a standard text SMS.
    • Caller's phone number is displayed as SMS on your phone. For example, if the caller's phone number is 12345678, the SMS will display 12345678.

    *Alerts will not be sent for calls made from overseas or public pay phones.

  3. I am a GSM1800 postpaid subscriber, can I subscribe for this service?

    Yes, but you will need to exchange your G18 SIM Card for a G9 SIM Card in order to enjoy this service. There will be no change to your existing mobile number and price plan.

  4. I am a prepaid subscriber, can I subscribe for this service?

    No, this service is available to GSM900 postpaid subscribers only.

Using Caller Alert

  1. Does Caller Alert work when I'm roaming overseas?

    Caller Alert will work overseas if the mobile phone is turned off. SMS notifications will be sent once the mobile phone is switched on again.

  2. How do I receive the SMS notifications for calls made to my mobile phone number during the period when I am not reachable?

    The Caller Alert service is subject to the following limits:

    • 20 SMS notifications per day; and
    • 1 alert for each missed call

    If someone tries to call you 24 times while your phone is off, you will receive SMS notifications of only the first 20 missed calls when you switch on your phone again. Notifications expire after 48 hours. If the missed call took place more than 48 hours before you switch on your phone, you will not receive an SMS notification of that call.

  3. Does the time and date of the SMS indicate when the caller tried calling me? How long does it take for the SMS notification to be sent?

    No, it may not be an indication of when the caller tried to call you. We try to send the SMS notification to you immediately, but the following factors will affect when you receive the SMS notification:

    • The phone memory is full
    • The earliest time you switch on your phone
  4. Can I opt out of Caller Alert?

    Yes, you may opt out by calling 1626.

    Alternatively, use *SEND 129 as follows: Receive Reply from: 727129
    Message Content: Caller Alert is Free and helps you manage your missed calls when your phone is switched off. To deactivate, reply ”1“ to confirm your request.
    Reply: 1
    Receive Reply from: *Send Help
    Message Content: Thank you. Your request will be processed within 2 working days. To activate Caller Alert, please call 1626.

    Your Caller Alert service will automatically be terminated should you subscribe to VoiceMail, One-mail, Duoline, Mobile No-Miss, Number Portability (to other service providers), or Data and GPRS main lines.

  5. Why can’t Voicemail subscribers enjoy Caller Alert?

    Voicemail is superior to Caller Alert. Besides providing SMS notifications when your phone is switched off, mobile Voicemail also provides SMS notifications when a call is unanswered for whatever reason, and allows the caller to leave a voice message for you.

  6. Will I automatically enjoy Caller Alert when I terminate my VoiceMail, One-mail, Duoline, or Mobile No-Miss service?

    Yes, if you are a GSM900 postpaid subscriber, Caller Alert will be activated automatically when you terminate your Voicemail, One-mail, Duoline or Mobile No-Miss service.

  7. Will I receive SMS notifications of calls from M1/StarHub subscribers and Singtel Mobile pre-paid subscribers?



  1. Is the caller charged for using Caller Alert?

    Both prepaid and postpaid subscribers will be charged the standard airtime rates for making the call. (The same charging principle applies when you reach a called party's voicemail.) M1 and StarHub subscribers are also charged standard airtime for making the call

  2. Will I incur charges for the SMS notification sent to the party I tried to call?

    No. The SMS notification is not deducted from your bundled SMSes either.

  3. As a postpaid caller roaming overseas, will I be charged when I am diverted to Caller Alert?

    You will not incur roaming airtime charges when you are diverted to Caller Alert (applicable for Auto Roam, Pay-As-You-Roam, GD121).

  4. As a prepaid caller roaming overseas, will I be charged when I am diverted to Caller Alert?

    You will not incur roaming airtime charges when you are diverted to Caller Alert while using *131*.

  5. As a prepaid mobile subscriber, will I get Caller Alert SMS when I miss a local call?

    No, Caller Alert is available only to postpaid subscribers.

          General Sales Enquiries