Microsoft teased the service at E3 2018 and formally announced Project xCloud several months later, in October 2018. They demonstrated the service in March 2019 with the racing game "Forza Horizon 4" playing on an Android smartphone with an Xbox One controller. Xbox head Phil Spencer used a private server during this time to test games on a remote connection. The service entered its home testing phase in May 2019, when it could be used outside the lab environment. It entered public testing later in the year and was unveiled at E3 2019.