iPhone 5 Won't Display Horizontally—Why?

[mrlynn]

billb wrote:
If you swipe up from the bottom to open the Control Center, do you have a 5th red icon on the right called orientation lock ?

Well, who knew? It can't have always been there, or one of us would have screwed it up by now. Which of the multitudinous updates introduced that red symbol?

Thanks for the quick and telling responses, folks. I was afraid I would have to go to the Apple Store myself!

/Mr Lynn