Apple has always been cautious about exposing private information about its users to app developers or websites, however its approach prior to iOS 6 was piecemeal and incomplete. For example, location data provided by CoreLocation has always required user permission; but calendar access only had rudimentary protection. With the release of iOS 6, Apple has closed the privacy gap while preserving the relationship with developers and advertisers wherever possible. Developers can explain why an app needs certain privacy-related features when posting a new app version by providing a detailed description of how and why that data is used. Five different types of user data are now isolated from developers until explicit permission is granted: device location, contacts, calendars, reminders, and photos. It is especially beneficial for users to upgrade to the new OS because this protection is enabled for all apps without requiring a new version or special recompilation.

Every iOS app should be thoroughly tested in a variety of network conditions, from a high-bandwidth WiFi connection down to a data connection with a single measly bar of Edge or GPRS coverage. Finding a good connection is usually the easiest, you're almost guaranteed to have one at work or home, but reliably testing an intermittent or poor connection is much harder. The obvious way to do this is to take note of coverage dead spots as you go about your day and return to those locations to test the app, but that can be time consuming and unreliable. However, if you have Max OS X 10.7 you can simulate any network connection without even leaving your desk.