A free app for Android, by EZ Mobile.

PDF Reader: Viewer is a fast, reliable, and easy-to-use app to view PDF files on your phone. It also has a simple user interface that lets you browse through your files quickly and easily.

You can search through your PDF files for keywords, and you can also add annotations to the document. It’s a great app to view PDFs on your phone or tablet. What’s more, PDF Reader: Viewer is designed to be used offline, so you don’t have to worry about data charges when using it.