How to  know device type (Simulator, iPhone, iPod, iPad, iPad mini, Apple TV) programmatically ?
OR
How to  know device model (iPad1, iPad2... etc) or (iPhone, iPhone4s...etc) programmatically ?

#import <sys/utsname.h>

struct utsname systemInfo;
uname(&systemInfo);

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

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


NSString *modelNumber = @"?";

//Simulator

if([modelName isEqualToString:@"i386"] || [modelName isEqualToString:@"x86_64"]) {
    modelName = @"iPhone Simulator";
}

//iPhone

else if([modelName isEqualToString:@"iPhone1,1"]) {
    modelName = @"iPhone";
    modelNumber = @"A1203";
}
else if([modelName isEqualToString:@"iPhone1,2"]) {
    modelName = @"iPhone 3G";
    modelNumber = @"A1241/A1324";
}
else if([modelName isEqualToString:@"iPhone2,1"]) {
    modelName = @"iPhone 3GS";
    modelNumber = @"A1303/A1325";
}
else if([modelName isEqualToString:@"iPhone3,1"]) {
    modelName = @"iPhone 4 (GSM)";
    modelNumber = @"A1332";
}
else if([modelName isEqualToString:@"iPhone3,2"]) {
    modelName = @"iPhone 4 GSM Rev A";
    modelNumber = @"?";
}
else if([modelName isEqualToString:@"iPhone3,3"]) {
    modelName = @"iPhone 4 (CDMA)";
    modelNumber = @"A1349";
}
else if([modelName isEqualToString:@"iPhone4,1"]) {
    modelName = @"iPhone 4S";
    modelNumber = @"A1387/A1431";
}
else if([modelName isEqualToString:@"iPhone5,1"]) {
    modelName = @"iPhone 5 (GSM)";
    modelNumber = @"A1428";
}
else if([modelName isEqualToString:@"iPhone5,2"]) {
    modelName = @"iPhone 5 (GSM+CDMA)";
    modelNumber = @"A1429/A1442";
}

//iPod touch

else if([modelName isEqualToString:@"iPod1,1"]) {
    modelName = @"iPod touch 1G";
    modelNumber = @"A1213";
}
else if([modelName isEqualToString:@"iPod2,1"]) {
    modelName = @"iPod touch 2G";
    modelNumber = @"A1288";
}
else if([modelName isEqualToString:@"iPod3,1"]) {
    modelName = @"iPod touch 3G";
    modelNumber = @"A1318";
}
else if([modelName isEqualToString:@"iPod4,1"]) {
    modelName = @"iPod touch 4G";
    modelNumber = @"A1367";
}
else if([modelName isEqualToString:@"iPod5,1"]) {
    modelName = @"iPod touch 5G";
    modelNumber = @"A1421";
}

//iPad

else if([modelName isEqualToString:@"iPad1,1"]) {
    modelName = @"iPad 1G";
    modelNumber = @"A1219/A1337";
}
else if([modelName isEqualToString:@"iPad2,1"]) {
    modelName = @"iPad 2 (WiFi)";
    modelNumber = @"A1395";
}
else if([modelName isEqualToString:@"iPad2,2"]) {
    modelName = @"iPad 2 (GSM)";
    modelNumber = @"A1396";
}
else if([modelName isEqualToString:@"iPad2,3"]) {
    modelName = @"iPad 2 (CDMA)";
    modelNumber = @"A1397";
}
else if([modelName isEqualToString:@"iPad2,4"]) {
    modelName = @"iPad 2 (WiFi + Rev A)";
    modelNumber = @"A1395";
}
else if([modelName isEqualToString:@"iPad3,1"]) {
    modelName = @"iPad 3 (WiFi)";
    modelNumber = @"A1416";
}
else if([modelName isEqualToString:@"iPad3,2"]) {
    modelName = @"iPad 3 (GSM+CDMA)";
    modelNumber = @"A1403";
}
else if([modelName isEqualToString:@"iPad3,3"]) {
    modelName = @"iPad 3 (GSM)";
    modelNumber = @"A1430";
}
else if([modelName isEqualToString:@"iPad3,4"]) {
    modelName = @"iPad 4 (WiFi)";
    modelNumber = @"A1458";
}
else if([modelName isEqualToString:@"iPad3,5"]) {
    modelName = @"iPad 4 (GSM)";
    modelNumber = @"A1459";
}
else if([modelName isEqualToString:@"iPad3,6"]) {
    modelName = @"iPad 4 (GSM+CDMA)";
    modelNumber = @"A1460";
}

//iPad mini

else if([modelName isEqualToString:@"iPad2,5"]) {
    modelName = @"iPad mini (WiFi)";
    modelNumber = @"A1432";
}
else if([modelName isEqualToString:@"iPad2,6"]) {
    modelName = @"iPad mini (GSM)";
    modelNumber = @"A1454";
}
else if([modelName isEqualToString:@"iPad2,7"]) {
    modelName = @"iPad mini (GSM+CDMA)";
    modelNumber = @"A1455";
}

//Apple TV, just for funn:)

else if([modelName isEqualToString:@"AppleTV2,1"]) {
    modelName = @"Apple TV 2G";
    modelNumber = @"A1378";
}
else if([modelName isEqualToString:@"AppleTV3,1"]) {
    modelName = @"Apple TV 3G";
    modelNumber = @"A1427";
}
else if([modelName isEqualToString:@"AppleTV3,2"]) {
    modelName = @"Apple TV 3G (Rev A)";
    modelNumber = @"A1469";
}

NSLog(@"Device model: %@/ %@",modelName,modelNumber);

Happy Coding :)