Calling malaysia from singapore in the cheapest way

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I wonder if anyone out here has any idea on calling malaysia from singapore in the cheapest possible way?

Of course, I mean other than using msn, skype.

I know phoenix card is one solution..but any other ways?

I will appreciate if anyone can give me some advices on this.

I'm quite annoyed and disappointed that despite the world is globalising, yet the international rate for calling still expensive..