And another thing. Along with the auto-correct, the auto-fill feature on my phone. It's often very helpful ... but when it isn't, watch out!
It apparently doesn't know anything about contractions, and offers up the most bizarre choices for "I'll", "don't", and the like, none of which are correct.
And unless there's a setting I don't know about, it doesn't remember anything you accept as a word to build up a personal dictionary, so you go through life pecking the same things out every day.