BlackBerry 4.5 - 5.0 versions:

1. From the home screen, click Options > Status.
2. The WLAN MAC field displays the MAC address for the smartphone.
    

BlackBerry 6 - 7.1 versions:

1. From the home screen, select Setup > Options > Device > Device and Status Information.
2. The WLAN MAC field displays the MAC address for the smartphone.
    

BlackBerry 10 OS version:

1. From the home screen select Settings > Network Connections > Wi-Fi > Advanced.
2. In the Diagnostic Information drop-down, select  Device Information.
3. The Physical Address field displays the MAC address for the smartphone.

Blackberry Playbook Tablet:

1. From the Home Screen click on Options.
2. Next select About.
3. Next Select Network from drop down menu.