The iPhone 7 on iOS 15.7.3 is fully jailbreakable using palera1n .
The short answer is
Additionally, because iOS 15.7.3 is not the absolute latest minor version (15.7.9 exists), some users intentionally remain on this version to maintain compatibility with specific tweaks that have not been updated for newer point releases. The jailbreak community often recommends staying on the lowest possible iOS version to maximize stability and tweak support. iphone 7 ios 15.7.3 jailbreak
Apple dropped iPhone 7 from iOS 17 support. That means . Future security updates (15.7.9, etc.) will be rare and minor. Since Checkm8 is permanent, you don't need to worry about losing the ability to jailbreak, but you also don't gain new features. The iPhone 7 on iOS 15
The -f flag forces rootless (recommended for stability). If you want to attempt SEP passcode retention (experimental), use palera1n -f -s . Apple dropped iPhone 7 from iOS 17 support