All 1638 IDD registered customers will receive a 1638 IDD Service Number which enables you to make IDD calls from any phone. Even if your registered phones are not available for use, you can use our 1638 IDD Service Number to make IDD calls through any touch-tone phone. You get greater flexibility and convenience at the same unbeatable IDD rates.
Simply follow the steps below to call:
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
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Step 6:
Step 7:
(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.
& 
(Mobile Phone) or 
(Fixed-Line/ Fax)