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I hate to bring this thread back up to the top, but I'll answer this question:
You can double tap the home button to open up the recent program list, then go to the left to access the orientation lock. This method works on iOS 4.

Never discount the obvious

The new OS allows you to lock the orientation. If start clicking away like I did, you might lock it. The locking tool is in the multitasking toolbar on the far left.

Thank you Guys! I registered this site to thank you all! I really appreciated about your post. Double tap, go to left and bamm :D Problem Solved.. Thank You!!
 
Thanks dave420. I had found that button previously but didn't know what it was and had inadvertently clicked it.
Thanks again.
 
i downloaded the yelp app on my iphone 4 and it immediately lost all accelerometer functionality - all apps, mail, camera, safari... i restarted the phone, shut down, and reset all settings [in settings>general>reset all settings] and still no auto rotation. certain apps that only work in LS went to LS just fine and certain pages that were in LS before the auto rotate stopped working got stuck in LS and weren't able to go back to portrait... totally weird. not a huge in convenience, but still... well, you're reading this so you get the point.

it wasn't until i read the blurb on the apple hdwr troubleshooting page http://support.apple.com/kb/TS2802
and tried their suggested auto rotate test with the factory installed calculator app that it suddenly started working again. it took a few tries oriented vertically in all 4 orientations with a bit of a tap on the table but the accelerometer finally seemed to just get "unstuck".
it doesn't really make any sense to me - may have just been a coincidence - but it worked for me after trying everything else i could find via google searches.

a little nervous to re-install the yelp app. i believe it was the monocle feature that made my phone's accelerometer go haywire...

good luck everyone!:D
 
i downloaded the yelp app on my iphone 4 and it immediately lost all accelerometer functionality - all apps, mail, camera, safari... i restarted the phone, shut down, and reset all settings [in settings>general>reset all settings] and still no auto rotation. certain apps that only work in LS went to LS just fine and certain pages that were in LS before the auto rotate stopped working got stuck in LS and weren't able to go back to portrait... totally weird. not a huge in convenience, but still... well, you're reading this so you get the point.

it wasn't until i read the blurb on the apple hdwr troubleshooting page http://support.apple.com/kb/TS2802
and tried their suggested auto rotate test with the factory installed calculator app that it suddenly started working again. it took a few tries oriented vertically in all 4 orientations with a bit of a tap on the table but the accelerometer finally seemed to just get "unstuck".
it doesn't really make any sense to me - may have just been a coincidence - but it worked for me after trying everything else i could find via google searches.

a little nervous to re-install the yelp app. i believe it was the monocle feature that made my phone's accelerometer go haywire...

good luck everyone!:D

I came into this thread fully expecting to find some stupid thread revival from someone who didn't actually realize what they were commenting on

instead I find you, trying to be genuinely helpful for any who may also have this problem, and doing so by searching instead of starting a new thread

so instead, I thank you for doing things the right way
 
Thanks. It helped

i downloaded the yelp app on my iphone 4 and it immediately lost all accelerometer functionality - all apps, mail, camera, safari... i restarted the phone, shut down, and reset all settings [in settings>general>reset all settings] and still no auto rotation. certain apps that only work in LS went to LS just fine and certain pages that were in LS before the auto rotate stopped working got stuck in LS and weren't able to go back to portrait... totally weird. not a huge in convenience, but still... well, you're reading this so you get the point.

it wasn't until i read the blurb on the apple hdwr troubleshooting page http://support.apple.com/kb/TS2802
and tried their suggested auto rotate test with the factory installed calculator app that it suddenly started working again. it took a few tries oriented vertically in all 4 orientations with a bit of a tap on the table but the accelerometer finally seemed to just get "unstuck".
it doesn't really make any sense to me - may have just been a coincidence - but it worked for me after trying everything else i could find via google searches.

a little nervous to re-install the yelp app. i believe it was the monocle feature that made my phone's accelerometer go haywire...

good luck everyone!:D

Thanks for your help buddy. I was about to freak out when it happened today. but thanks to your post it works. I was a bit skeptical at first. But after doing what you did. It worked. And it just made me a happy camper. Need more guys like you in the thread.
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.0.2 Mobile/9A5259f Safari/6533.18.5)

Shot in the dark here, this may have been suggested as well, double tap home and make sure it's not locked in position. I'm sure u know but it's beside iPod controls on multi tasking bar
 
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