+ (NSString *)deviceModel {
    
    int mib[2];
    size_t len;
    char *machine;
    
    mib[0] = CTL_HW;
    mib[1] = HW_MACHINE;
    sysctl(mib, 2, NULL, &len, NULL, 0);
    machine = malloc(len);
    sysctl(mib, 2, machine, &len, NULL, 0);
    
    NSString *platform = [NSString stringWithCString:machine encoding:NSASCIIStringEncoding];
    free(machine);
    
    //MARK: - iPhone
    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone2G";
    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone3G";
    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone3GS";
    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone4";
    if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone4";
    if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone4";
    if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone4S";
    if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone5";
    if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone5";
    if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone5c";
    if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone5c";
    if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone5s";
    if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone5s";
    if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone6";
    if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone6Plus";
    if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone6s";
    if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone6sPlus";
    if ([platform isEqualToString:@"iPhone8,3"]) return @"iPhoneSE";
    if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhoneSE";
    if ([platform isEqualToString:@"iPhone9,1"]) return @"iPhone7";
    if ([platform isEqualToString:@"iPhone9,2"]) return @"iPhone7Plus";
    
    //MARK: - iPod Touch
    if ([platform isEqualToString:@"iPod1,1"])   return @"iPodTouch";
    if ([platform isEqualToString:@"iPod2,1"])   return @"iPodTouch2G";
    if ([platform isEqualToString:@"iPod3,1"])   return @"iPodTouch3G";
    if ([platform isEqualToString:@"iPod4,1"])   return @"iPodTouch4G";
    if ([platform isEqualToString:@"iPod5,1"])   return @"iPodTouch5G";
    if ([platform isEqualToString:@"iPod7,1"])   return @"iPodTouch6G";
    
    //MARK: - iPad
    if ([platform isEqualToString:@"iPad1,1"])   return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])   return @"iPad2";
    if ([platform isEqualToString:@"iPad2,2"])   return @"iPad2";
    if ([platform isEqualToString:@"iPad2,3"])   return @"iPad2";
    if ([platform isEqualToString:@"iPad2,4"])   return @"iPad2";
    if ([platform isEqualToString:@"iPad3,1"])   return @"iPad3";
    if ([platform isEqualToString:@"iPad3,2"])   return @"iPad3";
    if ([platform isEqualToString:@"iPad3,3"])   return @"iPad3";
    if ([platform isEqualToString:@"iPad3,4"])   return @"iPad4";
    if ([platform isEqualToString:@"iPad3,5"])   return @"iPad4";
    if ([platform isEqualToString:@"iPad3,6"])   return @"iPad4";
    
    //MARK: - iPad Air
    if ([platform isEqualToString:@"iPad4,1"])   return @"iPadAir";
    if ([platform isEqualToString:@"iPad4,2"])   return @"iPadAir";
    if ([platform isEqualToString:@"iPad4,3"])   return @"iPadAir";
    if ([platform isEqualToString:@"iPad5,3"])   return @"iPadAir2";
    if ([platform isEqualToString:@"iPad5,4"])   return @"iPadAir2";
    
    //MARK: - iPad mini
    if ([platform isEqualToString:@"iPad2,5"])   return @"iPadmini1G";
    if ([platform isEqualToString:@"iPad2,6"])   return @"iPadmini1G";
    if ([platform isEqualToString:@"iPad2,7"])   return @"iPadmini1G";
    if ([platform isEqualToString:@"iPad4,4"])   return @"iPadmini2";
    if ([platform isEqualToString:@"iPad4,5"])   return @"iPadmini2";
    if ([platform isEqualToString:@"iPad4,6"])   return @"iPadmini2";
    if ([platform isEqualToString:@"iPad4,7"])   return @"iPadmini3";
    if ([platform isEqualToString:@"iPad4,8"])   return @"iPadmini3";
    if ([platform isEqualToString:@"iPad4,9"])   return @"iPadmini3";
    if ([platform isEqualToString:@"iPad5,1"])   return @"iPadmini4";
    if ([platform isEqualToString:@"iPad5,2"])   return @"iPadmini4";
    
    if ([platform isEqualToString:@"i386"])      return @"iPhoneSimulator";
    if ([platform isEqualToString:@"x86_64"])    return @"iPhoneSimulator";
    
    return platform;
}