Can you spoof your iOS to pair an Apple Watch with an older iOS? I'll keep it short, if an iPhone is jailbroken can you spoof your iOS version to pair an Apple Watch running OS 4 or 3 for iOS 10 on an iPhone with iOS 9.3.2?
The Apple Watch relies heavily on support from the phone for a lot of common tasks, especially features like cellular data, notifications, and iMessage. It’s possible there would be a way to spoof the version the watch sees, but without a few copyrighted frameworks from iOS 11 or 10, it’d probably crash before you finished pairing.