How to change the firewall settings on my BlackBerry Curve 9300

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You can set up a firewall on your BlackBerry® smartphone to block certain types of incoming messages (e.g., text messages, PIN messages, email). In this example, we show you how to set up a firewall for personal email.
1. Press the Menu key.
2. Scroll to and select Options.
3. Scroll to and select Security Options.
4. Scroll to and select Firewall.
5. Select Status.
6. Select Enable.
7. Scroll to and select the required message type (e.g. BlackBerry Internet Service).
8. If required, scroll to and select Contacts.
This will allow email from contacts stored in your phonebook. All other incoming mail will be blocked.
9. To allow messages from a specific email address, select Specific addresses.
10. Press the Menu key.
11. Scroll to and select Configure Exceptions.
12. Press the Menu key.
13. Scroll to and select Add Email Address.
14. Enter the email address and press Select.
15. Press the Menu key.
16. Scroll to and select Save.
17. When all exceptions have been added, press the Menu key.
18. Select Save.
19. The firewall settings have been changed.
The blocked messages count is displayed on the firewall screen.