Reliance Jio has reignited the feature phone market with the launch of its latest JioPhone. It has even propelled other incumbent telecom operators into the market. On Tuesday, a report suggested that Airtel is planning to launch an ultra-cheap 4G smartphone as early as October. Last month, Idea-Vodafone also indicated towards the launch of a 4G smartphone priced at Rs 2,500. Also Read: JioPhone Effect: Airtel might launch Android 4G ...