I can't do anything complicated on my iPhone because the screen is just too small for all of the features to fit and work conveniently and I can't edit because of the size, even with a stylus. I get lost on what step I am trying to do. I read and send short e-mails, read Facebook and sometimes post a short status or 'like', only read eHell, and look information up when we are traveling. I marvel at people who do more.
Usually it is a telephone, address book, alarm clock, and wi-fi router.
In case you are interested, my iPad works beautifully on eHell except for the spellcheck feature which just doesn't work reliably, but I blame that on Safari, not eHell.