Android (operating system) and rival Linux mobile operating systems that were in development. These established players were skeptical: Nokia was quoted as saying "we don't see this as a threat," and a member of Microsoft's Windows Mobile team stated "I don't understand the impact that they are going to have." Since then Android has grown to become the most widely used smartphone operating system and "one of the fastest mobile experiences available". Reviewers have highlighted the open-source nature of the operating system as one of its defining strengths, allowing companies such as Nokia (Nokia X family), Amazon (Kindle Fire), Barnes & Noble (Nook),
Sony Mobile top 10 smartphone vendors globally for the first time in the first quarter of the year. Sony Mobile has been the only major smartphone OEM that has given support to developing communities of smaller, hacker-focused mobile operating systems during this time. In 2013 Sony released an experimental Firefox OS ROM for the Sony Xperia E device. In 2017 Sony got Sailfish OS into its Open Devices program. As a result, the Sailfish software has been officially ported to many Xperia devices. As of Q2 2018, Sony Mobile's smartphone market share in Japan was 12.5%, behind Apple and Sharp. In 2009,