My iPhone 4S won't change orientation from portrait to landscape even though its portrait orientation is unlocked? I got it two days ago and it has always been this way? Do I need to get a new one or can I fix it?

Try this

Restart iPhone: Hold down the Sleep/Wake button and the home button together until the apple logo appears (ignore the ON/OFF slider) then let both buttons go and wait for phone to restart (no data will be lost).

Using the phone while charging doesn't create a problem.. I do it all the time

Double tap the home button, swipe over to the right you will see on the left side a square and inside the square there is a circle with an arrow on the end if you see a lock in the center of it that means your screen is locked. To unlock just tap the square and the lock will disappear. I hope this helps. Good Luck!

Just a note: On the latest update for IPhone4-You pull up from bottom of screen and you will see a lot of options. There is a flashlight, a calculator...and a place to lock and unlock your portrait feature! The above solution didn't work for me so I am thinking it was on an older version. Who knows? Just thought I would add this suggestion in case anyone else was having a problem. You might give this a try!

Thank you, EsmeeLynne. My husband just handed me his iphone and said, "Fix it." And with your help I did!

After several months of being unable to switch from portrait to landscape I was convinced my iPhone was developing silicon dementia. Then I read this. Problem solved. Thank you very much!

cheers

greg