Informationweek reports on how Jonathan Zdziarski breaks Apple's security measures pretty swiftly, in a series of Youtube videos. While hackers will need physical access to the iPhone (thereby making them crooks), he does cut through the security that protects deleted voice mail, e-mail, and other data. Note that he is a security researcher and has skills that the garden variety pickpocket probably hasn't yet learned from iPhone Hacking for Dummies.
