Many people still believe that jailbreaking an iPhone, iPod touch, or iPad is a harmful thing to do. This is not entirely false, in the past, I have seen many people getting their jailbroken iOS device hacked or unauthorized access. As the result, some of their important data was stolen. On the brighter side, not every user who jailbreak their iPhone and iPad will face this issue.
From personal experiences and research, a jailbroken device is actually more secure than an iPhone or iPad that isn’t. Why? Because there are jailbreak tweaks that allow you to set a passcode on individual applications, lock certain features, and much more. As long as you’re aware of what you are installing then nothing bad will happen.