Skype is running a football world cup promotion offering free international calls to many countries for whole one month. The free minutes depends on countries.

Now make free calls to USA from your iPhone using this free iphone application. Whistlephone is available free of cost in the apple itunes store.

IndiaLD offers cheap calls to India at just half a cent. Call India cheap !!

Now you can make voip calls from your iPad using Truphone. Make cheap international calls using your iPAd.

Make cheap calls to India using Voip calls offered by AirtelAsia. Call India for free using mobile callback method.

A review which will help you decide whether to go for it, or not try PCO4Nri for calling India, making free calls to India

OneRupeeCall is offering free 3 minute call to
India. Using their Voip service make free international calls to India. I
have tried it and worked for me.

You know localphone has started offering free first call. That means you can call India free. Reliance India call is also a very cheap option.