UIDeviceHardware.h

//
//  UIDeviceHardware.h
//
//  Used to determine EXACT version of device software is running on.

#import <Foundation/Foundation.h>

@interface UIDeviceHardware : NSObject 

+ (NSString *)platform;
+ (NSString *)platformString;

@end

UIDeviceHardware.m

//
//  UIDeviceHardware.m
//
//  Used to determine EXACT version of device software is running on.

#import "UIDeviceHardware.h"
#include <sys/types.h>
#include <sys/sysctl.h>

@implementation UIDeviceHardware

+ (NSString *)platform
{
  size_t size;
  sysctlbyname("hw.machine", NULL, &size, NULL, 0);
  char *machine = malloc(size);
  sysctlbyname("hw.machine", machine, &size, NULL, 0);
  NSString *platform = [NSString stringWithUTF8String:machine];
  free(machine);
  return platform;
}

+ (NSString *)platformString
{
  NSString *platform = [self platform];
  
  if ([platform isEqualToString:@"iPhone1,1"])  return @"iPhone 1G";
  if ([platform isEqualToString:@"iPhone1,2"])  return @"iPhone 3G";
  if ([platform isEqualToString:@"iPhone2,1"])  return @"iPhone 3GS";
  if ([platform isEqualToString:@"iPhone3,1"])  return @"iPhone 4";
  if ([platform isEqualToString:@"iPhone3,3"])  return @"iPhone 4";
  if ([platform isEqualToString:@"iPhone4,1"])  return @"iPhone 4S";
  if ([platform isEqualToString:@"iPhone5,1"])  return @"iPhone 5 (GSM)";
  if ([platform isEqualToString:@"iPhone5,2"])  return @"iPhone 5 (GSM+CDMA)";
  if ([platform isEqualToString:@"iPod1,1"])    return @"iPod Touch 1G";
  if ([platform isEqualToString:@"iPod2,1"])    return @"iPod Touch 2G";
  if ([platform isEqualToString:@"iPod3,1"])    return @"iPod Touch 3G";
  if ([platform isEqualToString:@"iPod4,1"])    return @"iPod Touch 4G";
  if ([platform isEqualToString:@"iPod5,1"])    return @"iPod Touch 5G";
  if ([platform isEqualToString:@"iPad1,1"])    return @"iPad";
  if ([platform isEqualToString:@"iPad2,1"])    return @"iPad 2 (WiFi)";
  if ([platform isEqualToString:@"iPad2,2"])    return @"iPad 2 (GSM)";
  if ([platform isEqualToString:@"iPad2,3"])    return @"iPad 2 (CDMA)";
  if ([platform isEqualToString:@"iPad2,4"])    return @"iPad 2 (WiFi)";
  if ([platform isEqualToString:@"iPad2,5"])    return @"iPad Mini (WiFi)";
  if ([platform isEqualToString:@"iPad2,6"])    return @"iPad Mini (GSM)";
  if ([platform isEqualToString:@"iPad2,7"])    return @"iPad Mini (GSM+CDMA)";
  if ([platform isEqualToString:@"iPad3,1"])    return @"iPad 3 (WiFi)";
  if ([platform isEqualToString:@"iPad3,2"])    return @"iPad 3 (GSM)";
  if ([platform isEqualToString:@"iPad3,3"])    return @"iPad 3 (CDMA)";
  if ([platform isEqualToString:@"iPad3,4"])    return @"iPad 4 (WiFi)";
  if ([platform isEqualToString:@"iPad3,5"])    return @"iPad 4 (GSM)";
  if ([platform isEqualToString:@"iPad3,6"])    return @"iPad 4 (GSM+CDMA)";
  if ([platform isEqualToString:@"i386"])       return @"Simulator";
  if ([platform isEqualToString:@"x86_64"])     return @"Simulator";
  
  return platform;
}

@end

usage.txt

NSString *platform = [UIDeviceHardware platformString];