and Dropbox are also integrated by default. In addition, BlackBerry's messaging service BlackBerry Messenger is included, which supports video chat, VoIP and screen sharing. Third-party applications BlackBerry 10 can run applications that were written with its native SDK, Android applications compiled for API levels 10–18 (support varies per version) and applications written for Adobe AIR (only supported until version 10.3.1). BlackBerry 10 provides the distribution platform BlackBerry World. Since version 10.2.1, Android application packages can be installed directly, whereas on previous versions Android applications could only be installed through BlackBerry World or by sideloading, which required packaging such applications into a native package format (BAR). On version 10.3, BlackBerry Limited partnered with Amazon to bundle Amazon Appstore as another source of Android apps. At release in January 2013, BlackBerry 10 had 70,000 third-party applications. At the 2013 BlackBerry Live conference, BlackBerry announced that they had more than 120,000 applications. Some developers have offered applications to access the Google Play Store, although this is not sanctioned by BlackBerry or Google. Applications that depend on the Google Play Services framework may not run. Similarly, Android applications that require a newer API level than 18 cannot run on BlackBerry 10. Devices Released Devices BlackBerry 10 supports the following BlackBerry smartphones, all of which can run the latest version. The BlackBerry Leap is the last smartphone from BlackBerry to run the BlackBerry 10 operating system, as BlackBerry devices are now running Android instead. Canceled devices BlackBerry Colt, originally planned as the first QNX-powered BlackBerry smartphone BlackBerry Café, a 4.5" all-touch model intended for emerging markets BlackBerry Kopi, a 3.1" QWERTY model intended for emerging markets Developer activities Engagement strategy Building up to the launch, the company made substantial changes to how it had previously engaged developers, being substantially more active at courting developers, solving issues and being transparent about development updates. The company sent two teams to engage developers. The first, focused on acquiring premier applications from third parties. The second team focused on engaging the broader development community and building the platforms application count. Prototype smartphones In May 2012, the company released a prototype touch screen smartphone to BlackBerry developers as part of the BlackBerry 10 Jam Conference in Orlando, Florida. The Dev Alpha A''' device, which resembled a small BlackBerry PlayBook, ran an early version of the operating system and was provided as a means for developers to develop and test their