The system should not interfere with the user entering the data. In most cases, autocorrect does not help users but rather annoys them. Read here more:
Best Practices For Mobile Form Design - Smashing Magazine
Users can be hesitant to fill out forms. That is why it is our goal as designers to make the process of filling out a form as easy as possible. In this article, I'll share a number of practical techniques that are bound to help you design effective forms.