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    <p><strong>UPDATE: from iOS 8, we cannot retrieve the serial number of our iDevice.</strong></p> <p>To retrieve iphone serial number from Monotouch, you can use this technic:</p> <ol> <li>Create a static library .a from XCode that have a function to get serial number</li> <li>In MonoDevelop, create a binding project to bind you .a library into C# classes/functions (<a href="http://docs.xamarin.com/guides/ios/advanced_topics/binding_objective-c_libraries" rel="nofollow">http://docs.xamarin.com/guides/ios/advanced_topics/binding_objective-c_libraries</a>)</li> <li>In your application, you call this binding library (in step 2).</li> </ol> <hr> <p>For detail:</p> <p>STEP 1. In my library.a, I have a class DeviceInfo, here is the implementation to get Serial number</p> <pre><code>#import "DeviceInfo.h" #import &lt;dlfcn.h&gt; #import &lt;mach/port.h&gt; #import &lt;mach/kern_return.h&gt; @implementation DeviceInfo - (NSString *) serialNumber { NSString *serialNumber = nil; void *IOKit = dlopen("/System/Library/Frameworks/IOKit.framework/IOKit", RTLD_NOW); if (IOKit) { mach_port_t *kIOMasterPortDefault = dlsym(IOKit, "kIOMasterPortDefault"); CFMutableDictionaryRef (*IOServiceMatching)(const char *name) = dlsym(IOKit, "IOServiceMatching"); mach_port_t (*IOServiceGetMatchingService)(mach_port_t masterPort, CFDictionaryRef matching) = dlsym(IOKit, "IOServiceGetMatchingService"); CFTypeRef (*IORegistryEntryCreateCFProperty)(mach_port_t entry, CFStringRef key, CFAllocatorRef allocator, uint32_t options) = dlsym(IOKit, "IORegistryEntryCreateCFProperty"); kern_return_t (*IOObjectRelease)(mach_port_t object) = dlsym(IOKit, "IOObjectRelease"); if (kIOMasterPortDefault &amp;&amp; IOServiceGetMatchingService &amp;&amp; IORegistryEntryCreateCFProperty &amp;&amp; IOObjectRelease) { mach_port_t platformExpertDevice = IOServiceGetMatchingService(*kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice")); if (platformExpertDevice) { CFTypeRef platformSerialNumber = IORegistryEntryCreateCFProperty(platformExpertDevice, CFSTR("IOPlatformSerialNumber"), kCFAllocatorDefault, 0); if (CFGetTypeID(platformSerialNumber) == CFStringGetTypeID()) { serialNumber = [NSString stringWithString:(__bridge NSString*)platformSerialNumber]; CFRelease(platformSerialNumber); } IOObjectRelease(platformExpertDevice); } } dlclose(IOKit); } return serialNumber; } @end </code></pre> <p>STEP 2. In ApiDefinition.cs of my Binding Library project in Monotouch, I add this binding:</p> <pre><code>[BaseType (typeof (NSObject))] public interface DeviceInfo { [Export ("serialNumber")] NSString GetSerialNumber (); } </code></pre> <p>STEP 3. In my application, I import Reference to Binding library project in step 2, then add</p> <p>using MyBindingProject;</p> <p>...</p> <pre><code>string serialNumber = ""; try { DeviceInfo nativeDeviceInfo = new DeviceInfo (); NSString temp = nativeDeviceInfo.GetSerialNumber(); serialNumber = temp.ToString(); } catch (Exception ex) { Console.WriteLine("Cannot get serial number {0} - {1}",ex.Message, ex.StackTrace); } </code></pre> <p>Hope that helps. Don't hesitate if you have any question.</p>
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    1. COI tried the code and works fine for iOS7_beta. Bt, I am not sure whether, it will deprecate or not in near future, or the accessibility of the DLL IOKit.Framework will be affected? Please reply with valid link if you could find.
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    2. COAs an update, this appears to still work in IOS7.
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