Look at the traffic logs in Charles Proxy under the structure tab. Look for a file named buyProduct . Under the XML text response, you will see a massive list of numbers. These are the software version external identifiers (Build IDs) for every version of Facebook ever uploaded.

However, you must accept the trade-offs: weekly sideloading renewals (if using a free account), broken features, and potential security risks. For most users, the better path is to simply use Facebook in a web browser (Safari) via mbasic.facebook.com . That classic site offers the old speed and layout without installing any IPA at all.

The modern Facebook app runs dozens of background processes (location tracking, audio listening for stories, live video preloading). Old versions from 2016–2018 lack these battery-draining monsters.

If you need help choosing a specific version for your device, tell me you are using and its current iOS version . I can help you determine the most stable Facebook version for your setup. Share public link

But is it legal? Is it safe? And most importantly,

Once you have your IPA file (especially one from a third-party source), you need to get it onto your iPhone. Since it's not from the App Store, you must use a process called "sideloading." Here are the most popular tools.

The modern Facebook app is a powerhouse of features, but it comes at a cost. Frequent updates have turned the app into a storage-heavy, battery-draining utility that can severely lag on older iOS devices. If you are using an older iPhone or iPad, or simply prefer the streamlined, clutter-free interface of yesteryear, installing an older version of the Facebook app via an IPA file is the best solution.

Tap the icon and select the Facebook IPA file from your device's Files app.

Note: Free Apple developer certificates expire every 7 days. If you use this method, you will need to refresh the app weekly via Wi-Fi using the AltStore or Sideloadly desktop server. Method 3: For Jailbroken Devices (AppStore++)

Note: This requires technical skill and a list of historical version IDs.