The search giant has been accused of monopolizing space on Android devices by requiring manufacturers to bundle its own services and locking out the competition.
Russian search engine Yandex is up in arms over the bundling of Google's search app with Android.
During its annual Build developer conference, Microsoft shows off the latest features of its mobile operating system.
The supermarket giant will launch its own tablet this year, to compete with the likes of Amazon and Apple.
Prestigio makes a portable version that looks like a retro cigarette case.