If your iphone screen not responding to touch, there could be several possible causes. It occurs sometimes because of a software glitch, which can be temporary, particularly after the update or when there are too many applications running in the background. Being a refresher, start by restarting the device with the force. Also, make sure that your screen protector or case is not touching your touch. The display can also have problems with dirt, moisture or oil. In case the issue persists, it can be beneficial to update iOS or change settings. In more severe situations the digitizer hardware might require professional repair.