Step 2: Now Try Using the Front-Facing FaceTime Camera to See Light from an Infrared LED
Now point the FaceTime camera at the LED end of your TV remote control and press a button on the remote.
Your eye can't see the IR light, but now you will see the IR light appear in the viewfinder as a bright white light.
It turns out that the FaceTime camera on an iPhone 4 does NOT have IR filtering on it! Yay!
I hope this is useful to even just one person in the Instructables community. Please use this information for good, and not for evil.