Activating a device over the wireless network
If a user activates a BlackBerry® device over the wireless network, the user must authenticate with the device using an activation password that you provide. You can create an activation password using the BlackBerry Administration Service and communicate it to the user. You can also use IT policy rules to configure password requirements (such as duration, length, and strength), to specify password patterns, and to prevent specific passwords. For more information, see the BlackBerry Enterprise Server Policy Reference Guide.
The device uses the activation password to generate the device transport key. The device transport key authenticates the user and is designed to secure communication between the BlackBerry® Enterprise Server and device.
After the user activates the device, the BlackBerry Enterprise Server deletes the activation password. The user cannot use the same activation password to activate other devices.