How to get American Netflix?

How do you get American Netflix on iPhone 5?

Apple app store, on your phone installed from factory

No idea

Sign up for a VPN service that allows Netflix (about $10 a month):
http://torguard.net/blog/unblock-netflix-iphone/

You move to America.

If you're outside of America, you can't get American Netflix.

No, proxy servers won't work -- Netflix can detect those.