Evaphone.com has a great new service out where you get to make 2 free calls everyday. There is no need to register, and all you need is a microphone and headset. Just enter the full 00 + Country code to make the international call. After about 10 seconds you call will get connected.
For a free call this is an excellent service. You can make 2 * 1 minute calls to India mobiles. For Pakistan mobiles the call will last 15 seconds. For Bangladesh moble calls will last for 30 seconds and for Sri Lanka Mobile it will be about 10 seconds.
If you are looking for other ways to call abroad for free then look around this website. There are many other ways to call Pakistan for free. For example you can dial a 0121 landline access number and call Pakistan Landline for 5 Minutes every hour for free.