I used up all the space on my 11 home screens with apps, then installed another app (which can only be found through search as it's installed 'offscreen'). To make more space, I put a lot of different apps into folders.
How do I restore the hidden app back to a home screen?
If I reset the home screens then my folders are lost and an app will be off screen again, and I'd be back to square one.
Running iPhone 4, iOS 4.3.
Best Answer
There's actually an easier way to do this, and it doesn't require connecting to iTunes.
If you have extra space on a screen, as it sounds like the OP had after arranging their apps into groups (folders), all you need to do is to reboot your phone, and the app will reappear in one of the blank spaces on the screen.
You can use either a soft reboot or a hard (RAM) reboot to do this, so it's as complicated as turning off your phone and turning it back on again.
If anyone would like to test this, I have a known, reproducible bug in iOS 6 for throwing an icon "off-screen" that I can share.