BlackBerry announced in May that it would bring its BlackBerry Messenger (BBM) platform to iOS and after sending out beta invites to the service in early August, the company has now posted (via TechCrunch) a user guide that suggests the app's launch may be imminent. BBM, which functions similarly to Apple's iMessage, was one of the first proprietary mobile messaging services and remains popular to this day with more than 60 million monthly active users.
