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'Guest mode' for BYOD users
Particularly for those who own iPads and have kids, for instance, those who institute the bring-your-own-device (BYOD) model at work and must comply with corporate IT policies could benefit from having a "guest mode" for their device.
Apple already implemented this feature in iOS to lock the device into an application until an "administrator" (or parent!) unlocks the device for full use again. That said, the ability to log in with guest user accounts would be a plus. This is already provided by third-party applications (notably jailbroken iPad apps).
AirDrop for simple file-sharing functionality
Often, there aren't any networked cloud or local storage solutions available, particularly in small- to medium-sized businesses. Many users are stuck resorting to emailing their files to one another. If there were multiple iOS-powered devices on the same network — in many cases, companies either go all in or all out with iPads — Apple could include its desktop OS X-based AirDrop file-sharing service in iOS 7, benefiting those who need to share company files between devices.
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.