The way I read it in the Help app, the service is provided by your carrier (your mobile service company).
From the following ...
To perform this task, your BlackBerry® device must use a SIM card, and your wireless service provider must set up your SIM card with a cell broadcast channel or provide you with the ID for a cell broadcast channel. |
Depending on your wireless service provider and the wireless network that your device is connected to, this feature might not be supported.
On the Home screen or in a folder, click the Options icon.
Click Advanced Options.
Click Cell Broadcast Settings.
Change the Cell Broadcasting Service field to On.
Perform one of the following actions:
If a cell broadcast channel appears on the screen, select the check box beside the channel.
If a cell broadcast channel does not appear on the screen, highlight the Empty field. Click Add Channel. Type the channel ID and a nickname. Click OK.
Select the check box beside a language.
Press the Menu key.
To turn off cell broadcasting, change the Cell Broadcasting Service field to Off. Before you turn off cell broadcasting, verify that your wireless service provider does not use cell broadcasting to manage services, such as preferred rates, based on your location.
... I gather you get Channel ID's from your carrier, if it supports the service. Posted via BlackBerryForums.com Mobile