1. Network Encryption: The first step is to ensure your mobile broadband network is encrypted. Use Wi-Fi Protected Access 2 (WPA2) or Wi-Fi Protected Access 3 (WPA3) encryption. They are the most secure encryption standards available at the moment.

2. Strong Passwords: Always use a strong, unique password for your network. This will make it more difficult for unauthorized users to gain access.

3. VPN: A Virtual Private Network (VPN) can provide an extra layer of security by encrypting all data that passes through the network.

4. Firewall: Enabling a firewall can help to block unauthorized access to your network.

5. Disable SSID Broadcasting: This feature makes your network invisible to devices that are searching for a connection. While it's not foolproof, it can deter casual hackers.

6. Enable MAC Address Filtering: This feature allows you to specify which devices are allowed to connect to your network.

7. Regularly Update Firmware: Make sure to regularly update your router's firmware. These updates often include security patches that can help protect your network.

8. Disable Remote Management: This feature allows you to manage your router's settings from anywhere. However, it can also be exploited by hackers. It's best to disable it unless you really need it.

9. Use HTTPS: When browsing the web, make sure to use websites that use HTTPS, which encrypts data between your device and the website.

10. Be Wary of Public Wi-Fi: Public Wi-Fi networks can be insecure and potentially expose your data to hackers. If you have to use a public Wi-Fi network, use a VPN to secure your data.