If you have a cracked phone/tablet where the touch is broken. You can can use it by connecting external keyboard and mouse.

How to do it ?

If your device has a micro USB port, you can use a USB On-The-Go cable (provided your device supports USB On-The-Go.

CNET has a good article on this and also how to convert it into an ebook reader.

Read More:  http://cnettv.cnet.com/turn-cracked-nexus-7-e-book-reader/9742-1_53-50150705.html