Here’s a picture of a “typical” email message, viewed on my iPhone. Definitely readable, though a little small after a long day. (If it looks a little blurry that’s the screen-shot’s fault, not the iPhone’s. It’s sharp as a tack on the iPhone.)
Here’s the same email, with the iPhone turned sideways. I knew it would rotate but I didn’t know it would enlarge. But, as you can see, it does. How handy, especially for those occasional times when your eyes are tired. Turn it back the other way and you’re back to normal. Well, maybe YOU’RE not. But your email font size is.
Give it a try. Free, and easily worth twice as much.