Well on a phone there really isn't a way to save pages as text files. Were you to save them, they would come out as html. You can save them and maybe find an app that will convert them to text, but depending on how complex the page it, that may not be possible on a phone.
In such a case you would need to save the pages and convert them to text on a computer. However, in a conversion, you would lose things like images, formatting, etc.