A good amount of smartphone users have experienced unresponsive screen touch issues. In most cases the issue is caused by a bug or rogue app that is causing a freeze on your screen or slowing down your device. Fortunately, the problem can usually be resolved by rebooting your device and clearing out the rogue apps. Other possible causes of the issue include a dirty screen, screen protector or a damaged display. In some cases the problem may be exacerbated by the use of a screen protector, so it is important to clean your phone or remove the screen protector and see if the device responds better.
The simplest solution for the "my touchscreen doesn't work" problem is to force restart your iPhone. You can do this by pressing the power button and the volume down button simultaneously. It may take a while for the device to restart, but this should solve the problem in most cases. In some cases, the problem may be caused by a hardware defect in the device, so you might need to contact an authorized service center for repair.
Another simple solution for the problem is to download and install TouchFreeze, a lightweight utility that can disable your touchpad while you are typing. This free, open-source program is available from the Google code website and only requires 100kb of disk space to run. Once installed, the application will appear in the system tray and can be launched at startup by clicking on its icon.