I have an iPhone. How do I find out if it's a 5 or 6?

I have an iPhone. How do I find out if it's a 5 or 6?

Plug it into your computer and let iTunes open up. When you go to set up your phone you will be able to see a description of the phone details there. Or I think you should be able to go into settings>>> general>> about. It should be shown in there but I'm not 100% sure