Chinese tech giant Tencent has sued major Chinese phone maker Vivo for blocking users from downloading Tencent’s app store Yingyongbao. Tencent accused Vivo of restricting users from downloading Yingyongbao and guiding them to use Vivo’s app store instead. Chinese phone makers using the Android ecosystem often develop their own built-in app stores while offering several additional third-party app stores, as it is often difficult to obtain all apps from any single app store. According to the court’s announcement, the case will be heard in Shandong province on Friday. [Forbes, in Chinese]