re: iPhone stuck during installation of new OS
I think there is some software relate problem happened in your iphone. It seems that your iphone update is not fully installed. In this situation you have to put your iphone in recovery mode so that your iphone become stable. If you don't know how to put iphone in recovery mode then try following steps:
Hold down the "Home" button when the iphone is resetting and don't lift up until logo of Itunes with Symbol of plug underneath appears. Just try this steps and let me know whether it works or not.
In The Absence Of Light
Darkness Prevail's
Bookmarks