I was fiddling around with a friend’s iPhone 3G, looking for undocumented functions and features (it’s a pastime of mine).
I found out that if you press and hold the Home button and press the Sleep/Wake button, the screen flashes, and a screen grab (or screenshot) is taken of what’s currently displayed on the iPhone screen.
- Press and hold the Home button below the screen.
- Press the Sleep/Wake Up button at the top edge of the phone.
- Flash!
The screen grabs are stored in the Camera Roll library in the Photos App.
Apparently this only works on version 2.0 firmware and up.
