if they installed and enabled ssh on their jailbroken iphone. which most people don't. if you don't jailbreak your device you have even less to worry about.
there are no viruses for the iphone, touch or ipad. one of the advantages of a closed design and apple's "sandbox" model. so nothing to worry about at this time. anyone who tries to sell you a security application is pretty much selling you digital snake oil.
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