See:
https://forums.macrumors.com/threads/730946/. Sometimes it's worth using google or mroogle to search the forums before posting
I found my answer there, but had to red thru a lot of trash to get the answer. It is there. Thanks to "FeliceMaxine for answering it clearly, in such a way that someone searching the forum can find the answer!
Here is more info, with an image specific to this issue.
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For those trying to figure out how to "Unlock iPhone screen rotation". With IOS4 they gave us quick access to the iPod controls and also Screen orientation lock.
This is a "setting" that is NOT found in the iPhone "Settings" app! Anyway I've been trying to find it for a couple weeks now. Seems like it could be 'repeated' in the settings app, so it would be easier to find.
Thanks BHP41!
-doubleclick the 'home' button,
-slide all the icons to the right (and look on the left side)
You will see the screen lock icon which will toggle your 'screen orientation lock' to 'off'.
(Image from 'theiphoneguru.com')