iOS 5.1.1 has trashed my iPhone 4

iOS and iPadOS

I phone 4 update 5.1.1 has caused serious bugs on my phone.
I can't unlock or even get the slide to unlock touch screen to work. Only slide to power off will work.  The new updated camera feature on the slide to unlock screen won't work and only happens at occasional times of docking my phone to my charger.?!  I can't unlock my phone, access my texts, contacts,  or even use my phone!