Seven years after its debut, BlackBerry Messenger leaves its walled garden and heads to iPhones and Android devices. The app, which is free to download in the Google Play store and App Store, offers the typical BBM experience with photo sharing, group chats, and those handy little icons that tell you when your friend received and read your message.
After you sign up for an account (or log in to an existing one), you'll get to the main screen of the app, which shows your most recent chats.
Adding contacts to BBM is a tedious process. You need to invite your friends to chat with you by sending your unique PIN by e-mail, text message, or BBM message. Once they accept the invitation, you can start chatting. You get a PIN when you sign up for an account.