UPDATE; BlackBerry Messenger coming to iOS and Android on June 27th

BlackBerry Messenger will be arriving on iOS and Android in exactly three weeks. T-Mobile UK revealed the date on Twitter, teasing a photo of the previously BlackBerry-exclusive chat service running on a Galaxy S3. BlackBerry announced last month that BBM would be going cross-platform sometime during the summer, and that its first release would support devices running iOS 6 and Android 4.0 or higher. CEO Thorsten Heins said at the time that bringing the chat service to other platforms was a sign of confidence — but while BBM may have been a unique service several years ago, it’s now going up against built-in services like iMessage and a slew of chat apps all vying for dominance.