No more horizontal view in iP4! Fixable?

[Jusfer]

My otherwise still fine iPhone 4 is not rotating the screen anymore when I turn it horizontal. I assume the motion sensor is dead.

Can this be fixed? How?

ETA: if it is of any relevance, I am still on iOS 5.1.1
I have not changed iOS for many months, but the issue appeared only yesterday.
I have not updated any apps to iOS6
Could my issue be cause by the old OS?

 

[Applejuiced]

You're sure the orientation lock is not turned on?

 

[Tyler23]

My otherwise still fine iPhone 4 is not rotating the screen anymore when I turn it horizontal. I assume the motion sensor is dead.

Can this be fixed? How?

ETA: if it is of any relevance, I am still on iOS 5.1.1
I have not changed iOS for many months, but the issue appeared only yesterday.
I have not updated any apps to iOS6
Could my issue be cause by the old OS?

Going along with Applejuiced's post, check your status bar, is there a lock with a circle around it to the left of your battery icon?

 

[Jusfer]

YES! Thank you. That circle icon is there. I looked long and hard to find the setting to control that but could not find it. Where is it?

 

[zorinlynx]

YES! Thank you. That circle icon is there. I looked long and hard to find the setting to control that but could not find it. Where is it?

Double tap the home button, swipe the row of icons on the bottom to the right. The lock control should be there. Tap it.

 

[Jusfer]

Thank you, there it was.

I must have tapped it when I tried to close all those open apps in an attempt to slow down battery drain. I thought it was part of the music app.

Happy again and no more need to research buying an unlocked i5.

 

[L-Tuned]

Thank you, there it was.

I must have tapped it when I tried to close all those open apps in an attempt to slow down battery drain. I thought it was part of the music app.

Happy again and no more need to research buying an unlocked i5.

There's an article saying closing all the apps under multitask manager doesn't help you stop to battery draining.

 

[Applejuiced]

Congradulations

 

[Jusfer]

Congradulations

Thanks Applejuiced, you had nailed it!