11.3 iOS jailbreak was made for iPhone, a computer security researcher managing to exploit Apple's operating system shortly after its release. The computer security researcher disclosed to Microsoft the exploits used to jailbreak iOS 11.3, so Apple still does not know about its existence, and it will not be used in any public solution.
iOS 11.3 jailbreak will not be released based on these exploits, but I don't even know how important this is since iOS 11.3.1 was already released by Apple this week. It's hard to say if the same exploits can be used in an iOS 11.3.1 jailbreak solution, so it remains to be seen if someone else will release an iOS 11.3 jailbreak solution.
iOS 11.3 Jailbreak was Done on iPhone
iOS 11.3 jailbreak is not a priority for any computer security researcher or hacker, as long as the discovered vulnerabilities can bring them very large sums of money from Apple or other companies. Apple pays up to $200.000 for exploits used in jailbreak solutions, and hackers won't get that from the community who use this software.
iOS 11.3 jailbreak could be released at some point for all iDevice users, but for now there is no public information on the basis of which we can hope that this could happen. Having said that, if you are looking forward to the release of an iOS 11.3 jailbreak solution, then you need to be very patient.
