>What, if anything, do you use to read text file on iPhone?
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>One approach I use is emailing the text file to myself. Then I can open it on iPhone from mail. The downside is that iPhone does not recognize font sizes. For example if I email a text file created with font 12 points or 24 point, the text file, when opened on iPhone, looks like the same font size.

Text files don't store a font size. The font size would be a setting in your text editor. You would need a rich text or html file to size the text.