When the first iPhone hit the market on June 29, 2007, Apple was seen mainly as a maker of shiny, pricey baubles that were gobbled up eagerly by its millions of devoted fans. Security researchers and hardware hackers immediately set about looking for ways to get to the iPhone s guts. The first-generation iPhone mostly relied on security through obscurity to defend itself. Apple had done it’s level best to make all of this difficult, not necessarily for security reasons, but mostly because that’s how Apple does.
Source: https://threatpost.com/five-years-later-iphones-legacy-secure-062912/76751/