How to activate free caller tune on Jio?

Jio Summer Surprise
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Reliance Jio recently launched the Jio Dhan Dhana Dhan Offer after TRAI asked the company to end the Summer Surprise Offer. According to the Reliance Jio’s Dhan Dhana Dhan Offer, you will get 1GB/day at Rs 309 with unlimited calling for…