How to programmatically differentiate between iphone 4 and iphone 4S?

How to programmatically differentiate between iphone 4 and iphone 4S?
#include <sys/types.h>
#include <sys/sysctl.h>

- (NSString *)machine {
     size_t size;

    // Set 'oldp' parameter to NULL to get the size of the data
    // returned so we can allocate appropriate amount of space
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);

    // Allocate the space to store name
    char *name = malloc(size);

    // Get the platform name
    sysctlbyname("hw.machine", name, &size, NULL, 0);

    // Place name into a string
    NSString *machine = [NSString stringWithCString:name];

    // Done with this
    free(name);

    return machine;
}

+ (NSString*)deviceModelName {
    /*
     @"i386"      on the simulator
     @"iPod1,1"   on iPod Touch
     @"iPod2,1"   on iPod Touch Second Generation
     @"iPod3,1"   on iPod Touch Third Generation
     @"iPod4,1"   on iPod Touch Fourth Generation
     @"iPhone1,1" on iPhone
     @"iPhone1,2" on iPhone 3G
     @"iPhone2,1" on iPhone 3GS
     @"iPad1,1"   on iPad
     @"iPad2,1"   on iPad 2
     @"iPhone3,1" on iPhone 4
     @"iPhone4,1" on iPhone 4S
     */

    struct utsname systemInfo;

    uname(&systemInfo);

    NSString *modelName = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

    if([modelName isEqualToString:@"i386"]) {
        modelName = @"iPhone Simulator";
    }
    else if([modelName isEqualToString:@"iPhone1,1"]) {
        modelName = @"iPhone";
    }
    else if([modelName isEqualToString:@"iPhone1,2"]) {
        modelName = @"iPhone 3G";
    }
    else if([modelName isEqualToString:@"iPhone2,1"]) {
        modelName = @"iPhone 3GS";
    }
    else if([modelName isEqualToString:@"iPhone3,1"]) {
        modelName = @"iPhone 4";
    }
    else if([modelName isEqualToString:@"iPhone4,1"]) {
        modelName = @"iPhone 4S";
    }
    else if([modelName isEqualToString:@"iPod1,1"]) {
        modelName = @"iPod 1st Gen";
    }
    else if([modelName isEqualToString:@"iPod2,1"]) {
        modelName = @"iPod 2nd Gen";
    }
    else if([modelName isEqualToString:@"iPod3,1"]) {
        modelName = @"iPod 3rd Gen";
    }
    else if([modelName isEqualToString:@"iPad1,1"]) {
        modelName = @"iPad";
    }
    else if([modelName isEqualToString:@"iPad2,1"]) {
        modelName = @"iPad 2(WiFi)";
    }
    else if([modelName isEqualToString:@"iPad2,2"]) {
        modelName = @"iPad 2(GSM)";
    }
    else if([modelName isEqualToString:@"iPad2,3"]) {
        modelName = @"iPad 2(CDMA)";
    }

    return modelName;
}

NSLog(@"uniqueIdentifier: %@", [[UIDevice currentDevice] uniqueIdentifier]);
NSLog(@"name: %@", [[UIDevice currentDevice] name]);
NSLog(@"systemName: %@", [[UIDevice currentDevice] systemName]);
NSLog(@"systemVersion: %@", [[UIDevice currentDevice] systemVersion]);
NSLog(@"model: %@", [[UIDevice currentDevice] model]);
NSLog(@"localizedModel: %@", [[UIDevice currentDevice] localizedModel]);

UIDevice *device = [UIDevice currentDevice];
NSString *systemName = [device systemName];

UIDevice *device = [UIDevice currentDevice];
NSString *systemVersion = [device systemVersion];

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