Hi friends i have found a website which allows you to download a pc software for free and you can call most popular destinations for free
http://talkmember.mediaringtalk.com/mytalk/index.php i have tried the software and its working for united states. It also works from India to call united states, as it is offering free land line calls to UK any one who has a internet connection and the software downloaded into there pc in India can call to UK landlines i could not get any information about this software from india if any of you can try that and post your reply's whether the software is working from India to UK landlines.
viv