To resolve the issue of not being able to connect to your home WiFi network using your Android phone and the inability to open the Cox app, please follow these detailed steps:

1. Check WiFi Settings on Your Phone
- Go to your phone's Settings.
- Select Network & Internet or Connections.
- Tap WiFi and ensure that WiFi is turned on.
- Look for your home WiFi network in the list of available networks and try to reconnect.

2. Restart Your Phone
- Hold down the power button until the power menu appears.
- Select Restart or Reboot.
This can help clear any transient connectivity issues on your device.

3. Restart Your Modem/Router
- Unplug your Cox modem and router from power.
- Wait for about 30 seconds.
- Plug them back in and wait for all lights to stabilize (this might take a few minutes).

4. Forget and Reconnect to WiFi Network
- In your phone's WiFi settings, tap on your home network and select Forget.
- Wait a few moments, then tap on the network again and enter the WiFi password to reconnect.

5. Check for Device Compatibility
- Ensure that your Android device is compatible with the Cox Panoramic WiFi. Some devices may have known issues.
- You can verify compatibility through the Cox support page on troubleshooting device issues - learn more.

6. Update Your Device
- Check if there are any software updates available for your Android phone.
- Go to Settings > System > Software update to apply any updates. This may include fixes for network connectivity issues.

7. Reinstall or Update the Cox App
- If you cannot open the Cox app, your current installation might be corrupted.
- Go to the Google Play Store, search for the "Cox Panoramic Wifi" app, and check if an update is available. If that doesn't work, uninstall and then reinstall the app.

8. Use an Alternative Method to Manage Your Network
- If the app remains unusable, access your Cox Panoramic WiFi settings via a web browser:
- Connect to your WiFi network.
- Open a web browser and enter the IP address 192.168.0.1 (or the specific IP your modem uses).
- Log in using your admin credentials (default might be 'admin' for both username and password unless changed).

9. Check for Other Interference
- Ensure no other devices are connected that may cause interference.
- Move closer to your router to see if the signal improves.

10. Reach Out to Cox Support
- If you've followed all steps and still face issues, contacting Cox customer support may be necessary for further assistance and diagnostics specific to your setup - learn more.

By systematically following these steps, you should be able to identify and resolve the connectivity issue with your home WiFi network using your Android phone.