Why am I unable to slide my screen to answer a call?

[iMore Question]

I can't slide on my screen to answer a call

I was able to use my phone earlier today now I can't slide on the screen to answer a call

 

[Ledsteplin]

Re: I can't slide on my screen to answer a call

Welcome to iMore! Try a hard reset:
Hold the top or side power/sleep button and the home button at the same time until the Apple logo appears, then release.