If Facebook pages aren't loading on your iPhone, start by restarting your device to resolve minor glitches and ensure you have a stable Wi-Fi or cellular connection. Check for Facebook app updates in the App Store and force quit and relaunch the app if needed. If the issue persists, clear the app’s cache by going to Settings > General > iPhone Storage, selecting Facebook, deleting the app, and reinstalling it. Additionally, update your iPhone’s operating system by navigating to Settings > General > Software Update. If you're experiencing issues in Safari, try disabling extensions under Settings > Safari > Extensions, and if you're using a VPN, ensure it isn’t blocking Facebook. If none of these steps work, contact Facebook support for further assistance.