[aikinai]

There are times when jailbreaking an up-to-date iPhone is not possible, but right now the latest firmware can be rooted in a few minutes with a very simple program. It does not affect your Apple ID, iTunes association or anything other apps. It just gives you root access and installs the jailbroken app store from which you can install OpenSSH, etc.

I'm not sure if there are any trojans available, but if there were, you could easily install them and then either delete the jailbroken app store or just hide it from SpringBoard.

This process could easily be done in 10-15 minutes as long as you have physical access to the phone.