Simply put, this feature allows you to send and receive text messages and BBM messages in the BBM app*. On top of normal BBM messages, you can receive text messages from and send text messages to BBM contacts while using BBM.
In order to use this feature, you must have linked a BlackBerry Messenger contact with a contact that has a phone number in the Contacts app on your BlackBerry smartphone. In the screenshot below, you can see how a contact that uses text messaging appears while using BlackBerry Messenger.
To be able to text message a BBM contact that is linked to your address book, complete the following steps:
1.Open BBM, press the Menu key and select Options
2. Select the Show Text Messages From Contacts Linked with BlackBerry Contacts checkbox