I have tried to turn it off and lock it but the screen will not change. I have even tried to call it from my house phone, but it will not make any noise; even though the ringer is on.
Did you try a reset?
Try resetting:Hold both the home and power buttons at the same time until the Apple boot logo appears. No data will be lost.
try these steps: http://www.wikihow.com/Hard-Reset-an-iPhone
Hold the HOME and POWER buttons at the same time until an Apple logo appears. This will take 10-20 seconds of holding.
Retrieving data ...