Jailbreaking an iPhone or an iPad is not something that one should do unless they truly know what they are doing to their device. That is because while introducing a number of features that Apple wouldn't otherwise allow, it also poses security threats that you may not be aware of.
Here is a fresh example: a number of Dutch iPhone users who gave their smartphones the jailbreak treatment got their handsets hacked by an unknown hacker. Why? Simply because they failed to change the default SSH password on their devices. SSH is a a network protocol that is usually enabled after the jailbreak is performed so that the user can execute Terminal commands on the device. Anyone who has network access to an SSH-enabled device and know the login credentials technically has the power to make the device do their bidding.
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And sure enough, some of the victims paid the fee. Fortunately, the hacker was not after causing damage to anyone, which is why all the money that was obtained was given back afterwards. Furthermore, instructions for removing the security hole were sent by email, along with an apology for causing any trouble.
However, should the hacker wanted to, they could send text messages without the user's knowledge or obtain sensitive information, such as stored text messages. And the example above shows how dangerous jailbreaking can be unless one is aware of the risks that it brings along.
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