Vodafone Idea and Reliance Jio will start using Blockchain technology to block spam calls and messages. Both the networks will have a partnership with Tanla Solutions and Tech Mahindra. 700 million users will receive the benefits of this deployment. The technology will help users to set their communications preferences and consent for receiving such calls. A multi-year contract is signed by Vodafone and Jio with Tanla for blockchain technology.