Prevent your device from connecting to a Wi-Fi network
1.
On the Home screen, click the Manage Connections icon.
2. Click Wi-Fi Options.
3. Highlight a Wi-Fi® profile.
4. Press the Menu key.
5. Click Disable.
To allow your BlackBerry® device to connect to the Wi-Fi network again, highlight the Wi-Fi® profile and press the Menu key. Click Enable.