a few feature phones, including Alcatel's OneTouch Go Flip (known as Cingular Flip 2 on AT&T), Reliance Jio's JioPhone (LYF F30C), and Intex's Turbo+ 4G. The system brings support for 4G LTE, Wi-Fi, GPS, and HTML5-based apps onto non-touch devices with an optimized user interface, less memory usage, and longer battery life. B2G OS B2G OS (Boot 2 Gecko) was a community-developed mobile operating system, and the successor to Firefox OS. It follows the Firefox OS goal of providing a complete, community-based alternative operating system, that runs software as web applications. Its mobile apps therefore use open web standards and programming languages such as JavaScript and HTML5, a robust privilege model, and open web APIs that can communicate directly with the device's hardware. It is now the basis of KaiOS which has (as of January 2019) over 17 percent of the Indian mobile phone market and is the third most popular phone OS. KaiOS is closed-source. History B2G OS was forked from Firefox OS following Mozilla's decision to discontinue support for their mobile operating system. The decision was made, according to Ari Jaaksi and David Bryant, in order to "evolve quickly and enable substantial new architectural changes in Gecko, Mozilla’s Platform Engineering organization needs to remove all B2G-related code from mozilla-central." , B2G OS is no longer maintained. Comparison with Android Firefox OS used the Linux kernel like Android does. Firefox OS used the Gecko engine on top of the Linux kernel to render the screen output. Apps were written using HTML5, CSS, and JavaScript—all three being cooperative languages used in making internet webpages. In essence, apps on Firefox OS were web apps and the OS could be thought of as a Web browser that stored content off-line. On the other hand, Android's apps are coded in Java using Android Studio. Android also enjoys greater maturity and support. Despite these differences, Firefox OS did feature all the essentials required to use a smartphone. Firefox launched its first official device in Germany in 2014, which was an Alcatel One Touch Fire. The device had a 3.5” HVGA screen, Cortex A5 processor, 256MB RAM, and 512MB storage. , Mozilla had launched 12 smartphones across 24 countries. Criticisms Chris Ziegler of the technology website The Verge wrote that Firefox OS would take app distribution to the pre-iPhone era, requiring application developers to deal with multiple carriers and their app stores. At the Mobile