Yes, there are more chances for it...also you cannot jailbreak to unlock your phone...Jailbreak and Unlock are two different terms but they are both usually confused. Jailbreaking allows a user to install third party applications, software, themes and removes the limitations that are on the apple device. In short it gives the user the root access to iOS whereas unlocking means the user can switch between network carriers.To unlock an iPhone remote unlocking method is the best method. You can get the unlocking service from network provider, sometimes they deny. In that case you can get the remote unlocking service from trusted third party like Theunlockspot.com and follow the free unlocking instructions to easily unlock from the locked network.