MWC 2017 BlackBerry Live updates and announcement: The new BlackBerry Mercury smartphone will be revealed with detailed specifications and the final name. Mobile World Congress 2017 or MWC 2017 officially starts on February 27, but pre-announcements will take place this weekend, which is February 25 and February 26. Today Blackberry is hosting its MWC pre-briefing where it is expected to unveil the BlackBerry Mercury smartphone.