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Unlike other call apps, only the person who places the call needs to install Libon , whoever receives the call will only have to pick up the phone. With Libon you can Enjoy high quality international calls at the best prices to cell phones and landlines in over 150 countries with no hidden fees 

Skype a famous  best VoIP services and instant messaging clients that comes bundled with a powerful set of calling, video, messaging and sharing capabilities are now offering unlimited worldwide calls to keep in touch with friends and family ! - Unlimited calls to mobiles in 8 countries/regions and landlines in 63 first month free - No commitment to take up the subscription after your free trial has ended !

There are many websites which send free SMS to broaden the connectivity with your family and friends without compromising on your pocket. I have compiled a few of them which i checked and tested