Satya, thank you for your recommendation, I just looked at directron for modems but haven't found them selling gsm modems.
Let me show you the picture of GSM modem, I am looking for.You can see it @ Link hidden: Login to view
I would be looking at other suppliers in a while and post back with my findings.
btw, I forgot to mention 2 other requirements that must meet
1-ships to Pakistan/internationally
2-must accept paypal