Please suggest with following consideration.

1) I do not have internet connection so Yahoo, Skype , Google Talk is not goinf to work for me.

2) No online purchase possible for me as of now.

I am looking for those calling cards you can buy from hawker. I am located in TST area right now.
Actually, I gone ahead and did some search on my own about this.

I found if you are living in TST area, go to Chunking Mansions – Ground Floor. There are many indian/pakistani/bangaladeshi shops. Goto any teleshops. You could buy Calling card from there.

Printed cost on Calling card is 50 $ HKD. But you ask discount in Urdu/Hindi they give it for 38 $ HKD only !

Used two types of cards –

1. Unity Calling Card (RED in color) – you get 60 Min for 38 $
2. IP Phone Card (Yellow in color) – you get 80 Min for 38 $.

I found both are reliable but only one catch. Shop kepper tells you calling card base number is toll free but does not tell you that you can not call from Public Booth without for free. You pay 1 $ for 5 Min call.

There is option though, you do not need privacy for calling and just call to folks to say hello. You could make a call from Chunking Mainsions ground floor only. There are phones in front of shops. They allow you to call for FREE !