Luca Todesco, also known as qwertyoruiop, has released a 0day exploit for iOS 9.3.3b and lower after discovering that his exploit no longer works in iOS 10.
I0n1c has released an App Store app called 'System and Security Info' that can detect if your iPhone has been jailbroken or if there are any other anomalies on your device from a security standpoint.