Reliance Jio on Wednesday announced the launch of voice and video calls over Wi-Fi network service, which will roll out nation-wide by January 16. Aimed at improving call quality in indoor areas, the service works on any Wi-Fi network and it is free for Reliance Jio customers. Though the Jio network now supports voice and video calls over Wi-Fi network, it works only if the user has a compatible smartphone that supports the Wi-Fi calling feature. According to the statement released by the company, there are around 150 devices — including Apple and Samsung