获取iphone的系统信息使用[UIDevice currentDevice],信息如下：

[[UIDevice currentDevice] systemName]：系统名称，如iPhone OS

[[UIDevice currentDevice] systemVersion]：系统版本，如4.2.1

[[UIDevice currentDevice] model]：The model of the device，如iPhone或者iPod touch

[[UIDevice currentDevice] uniqueIdentifier]：设备的惟一标识号，deviceID

[[UIDevice currentDevice] name]：设备的名称，如 张三的iPhone

[[UIDevice currentDevice] localizedModel]：The model of the device as a localized string，类似model

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html