It keeps saying searching . It will not stay on

I'm having the same problem. The screen on my iPhone 4S was completely damage due to a lot of falls my boss change the screen for me it worked for one day. The next I keep saying searching . It will not stay on if it take it out the charger.i tried resetting the date still doesn't work the airplane mode nothing . And it will not let me turn on wifi .

Please help I'm expecting calls regarding job interview and my phone won't work

Mo