Help the iPhone touchscreen not responding

For the users of the iPhone which inside his functions is that the screen is tactile, which there are times does not answer and it us is impossible in occasions to be able to answer a call since the this totally blocked screen and he refuses to our order.

 What we must do in order that again our tactile screen of our cell phone iPhone answers us is:
 To keep the buttons pressed Beginning and Rest / activation at the same time, at least during 10 ó 15 seconds. On having realized these steps our tactile screen will return to work correctly.