Having an unlocked iPhone–without so much as a four-digit barrier between you and some subway snatcher–is asking for trouble. Four-digit passcodes or PINs were the only way to secure the earliest iPhone models. Today, 16 years after the iPhone’s debut, we have progressed to a six-digit standard passcode accompanied by fingerprint or face recognition biometrics. Consider that a four- or six-digit numerical PIN facilitates up to one million possible combinations. That’s not much in an era of speedy hacking
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