I am in Sri Lanka at the moment. I can make a call to a Sri Lankan phone number with my SH phone number. But I cannot receive a call from a Sri Lankan telephone number. Do I need to do any activations?
Since you can make a outgoing call in your location, then for incoming call should not be an issue.
Do check on your phone setting, on call setting.
If you have block certain line number from receiving, then you need to take note.
Incoming call from callers with setting, Caller Number Non Display, unknown number, etc.
For international calls, the caller mobile &or homeline when calling you, it would be stated as "Unknown number".
For this, you would not received any call, especially international calls.
You still able to make outgoing call.
So, you may have to reset your phone to not to block unknown/unlisted numbers.
I am not Starhub staff &or related to.