Applications designed for iPhone OS must be able to run on devices with different hardware features. Although features such as the accelerometers and Wi-Fi networking are available on all devices, some devices may not include a camera or GPS hardware. If your application requires such features, you should always notify the user of that fact before they purchase the application. For features that are not required, but which you might want to support when present, you must check to see if the feature is available before trying to use it.
Table lists the techniques for determining if certain types of hardware are available. You should use these techniques in cases where your application can function without the feature but still uses it when present.
Identifying available hardware feature
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