Kaspersky Lab’s David Emm is warning iPhone users who jailbreak their phone.
“If you unlock it you may get the flexibility that you are looking for but clearly there is a potential danger that [an] exploit code that has been written for that device might work whereas it wouldn’t necessarily do so had you not unlocked it.”
So if you have a jailbroken iPhone or plan to jailbreak your iPhone, be prepared for the risk.