Google Hangouts now lets you make free one-minute international calls in 25 countries (including the United States, India, etc.)
However, you’ll need to have some calling credit in your Google account (that you can add with your credit card) to get your first minute free, as you’ll be charged for the duration of your call beyond that first minute.
https://support.google.com/hangouts/answer/3204856?&ref_topic=3187124
Buy calling credit for phone calls – Hangouts Help
support.google.com
Almost all calls to the U.S. and Canada are free from all countries where Hangouts calling is available. A few U.S. and Canadian destinations will cost USD 1 cent per minute depending on the specific
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