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Longer PIN code for enhanced security
iOS currently provides two kinds of password security on the lock screen: A complex alphanumeric password, or a simple four-digit PIN code. In the case of the latter, most wannabe hackers are more than able to memorize a simple pattern, thus rendering the simple PIN code useless. And many owners don't want to use the longer alphanumeric password, because after a while it becomes tiresome when picking up their iPhone or iPad after only a few moments, in spite of company IT policies.
Enhancing the simple four-digit PIN code by a few extra blocks, such as seven or eight, would vastly improve security and simplicity for the end user. Everyone can remember a four-digit PIN code, but not everyone can memorize an eight-digit code.