Determine device (iPhone, iPod Touch) with iOS

Question

Is there a way to determine the device running an application. I want to distinguish between iPhone and iPod Touch, if possible.

Answer 1

Adding to Arash's code, I don't care for my app what model I'm using, I just want to know what kind of device, so, I can test as follows:

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
        {
            NSLog(@"I'm definitely an iPad");
    } else {
    NSString *deviceType = [UIDevice currentDevice].model;
                if([deviceType rangeOfString:@"iPhone"].location!=NSNotFound)
                {
                    NSLog(@"I must be an iPhone");

                } else {
                    NSLog(@"I think I'm an iPod");

                }
}