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Location-aware sound profiles
Apple has seemingly taken a backseat on location services with its mobile platform, while rival mobile platform makers have taken full advantage of APIs and functionality. It would, for example, be very useful for business users to detect when they are in the office or read a calendar entry setting, and have the phone automatically switch into "silent" mode depending on where they are.
Location-aware wi-fi networking
On the topic of location-aware features, a feature that many would love to see is the ability for the iPhone or cellular-enabled iPad to switch on wi-fi networking if they are in certain places. Because wi-fi can't turn itself on, it would make sense for iOS' location features to detect when a user is in the office or at home, and switch on wi-fi to cut down on data bills. This geo-fence technology is already used in iOS' Reminders app, and should be expanded to other areas of the mobile platform.
'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).