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1638 IDD
1638 IDD Service Number


If you have registered 1638 IDD, you will receive a 1638 IDD Service Number enabling you to make IDD calls from any touch tone phone, including unregistered ones, giving greater flexibility and convenience with economical IDD rates.

Simply follow the steps below to call:




  1. &


  2. (Mobile Phone) or (Fixed Line/ Fax)


Note to first-time users:


Your 1638 IDD Service Number must be used with a PIN number. If you have not yet set up a PIN for your 1638 IDD service, please call our Account Management Hotline at 2260 8000 using any of your pre-registered phone numbers to set your PIN and activate the "Account Password" function.