SMS authentication for mobile billing, improved push notifications, and three state settings for Do Not Track. Async Pan and Zoom (APZ), included in version 1.3, should improve user interface responsiveness. Work was done to optimize Firefox OS to run a 128 MB platform with version 1.3T. A 128 MB device is out that seems to use that version but it may be unfinished. In 2015, Mozilla ported Firefox OS (an "experimental version") to MIPS32 to work in a sub-$100 tablet (that can also run Android 4.4 KitKat). Mozilla has worked on developing the OS for Smart Feature Phones. Firefox OS was discontinued in January 2017. Digital rights management (DRM) In 2014, Gal announced a change in course, writing that future versions of the Firefox browser would include DRM. Implementation of DRM in the Firefox browser began with version 38. In August 2015, attempts by Matchstick TV (based on Firefox OS) to add DRM caused the demise of Matchstick, a decision that Boing Boing called "suicide-by-DRM". Demonstrations At Mobile World Congress 2012, Mozilla and Telefónica announced that the Spanish telecommunications provider intended to deliver "open Web devices" in 2012, based on HTML5 and these APIs. Mozilla also announced support for the project from Adobe and Qualcomm, and that Deutsche Telekom’s Innovation Labs would join the project. Mozilla demonstrated a "sneak preview" of the software and apps running on Samsung Galaxy S II phones (replacing their usual Android operating system). In August 2012, a Nokia employee demonstrated the OS running on a Raspberry Pi. Firefox OS is compatible with a number of devices, including Otoro, PandaBoard, Emulator (ARM and x86), Desktop, Nexus S, Nexus S 4G, Samsung Galaxy S II, Galaxy Nexus and Nexus 4. A MIPS port was created by Imagination Technologies in March 2015. In December 2012, Mozilla rolled out another update and released Firefox OS Simulator 1.0, which can be downloaded as an add-on for Firefox. The latest version of Firefox OS Simulator, version 4.0, was released on July 3, 2013 and announced on July 11, 2013. Mozilla's planned US$25 Firefox smartphone displayed at MWC, is built by Spreadtrum. Mozilla has collaborated with four handset makers and five wireless carriers to provide five Firefox-powered smartphones in Europe and Latin America so far with cellphone launches being led by UK marketer John D. Bernard. In India, Mozilla planned a launching at $25 in partnership with Intex & Spice, but the