iOS 5.1.1 upgrade: hot while usage and battery drain

Basic troubleshooting steps clearly outlined in the User Guide are restart, reset, restore from backup, restore as new device.

Have you tried ALL the troubleshooting steps? If you have and you're still having problems, then you'll need to bring your phone into Apple for evaluation and possible exchange.

This is not caused by 5.1.1 update. nothing like that would cause your phone to get "hot"

Kinst wrote:

No. Because why I need to do full restore and all other dancing if my iPhone worked well BEFORE but start to drain AFTER? If I had Samsung with Android, I would, but I think I have much more intelligent device.

Well, then go get a Samsung or Android. No one here really cares what you do. Meantime, if you want your phone to work again, you'll need to do the recommended troubleshooting steps. Or do nothing. Again, no one here really cares what you do.

http://www.apple.com/batteries/iphone.html

here is a general description of the batteries. it is expected that sometimes the product will get warm, especially when charging. Another thing to look at is multi-tasking which could be the result of some battery drainage, bluetooth running in the backround, a high brightness setting, wi-fi ALWAYS enabled even when outside of a wi-fi zone especially because it will be constantly searching for networks. For information about multi-tasking, try this:

http://support.apple.com/kb/HT4211

Worst comes to worst, try transfering all of your information to the computer, and try a restore as new, than transfer your information back to the iphone in the event it could be a software issue. here are some helpful articles to help you with this.

By following these articles in order, you will be able to save content to your computer from the iOS device.

Section 1:

-About authorizing and de-authorizing:

http://support.apple.com/kb/PH1730

Prevent unprompted syncing of your iPod, iPhone, or iPad:

Mac- http://support.apple.com/kb/PH1764

Windows- http://support.apple.com/kb/PH1677

Section 2:

-iOS how to transfer or sync content to your computer:

http://support.apple.com/kb/HT1296?viewlocale=en_US

Transfer purchases from your iPod, iphone, or iPad to an authorized computer:

Mac- http://support.apple.com/kb/PH2554

Windows- http://support.apple.com/kb/PH2566?viewlocale=en_US

iOS: Importing personal photos and videos from iOS devices to your computer:

http://support.apple.com/kb/HT4083

Backing up, updating and restoring:

http://support.apple.com/kb/HT1414?viewlocale=en_US

Downloading past purchases from the App Store, iBookstore, and iTunes store

http://support.apple.com/kb/HT2519

this is definitely an ios 5.1.1 issue...happened to me on my old phone immediately after upgrading (iphone 4s) which the apple guy replaced...and is now happening on my brand new iphone 4s, which i set up as a new phone.

seems to have something to do with location services and/or exchange?

any ideas?