Final answer:
To dismiss the iPhone keyboard, tap outside of the text field or tap the 'Done' button. If it doesn't disappear, a software glitch could be the issue, and closing and reopening the app usually helps.
Step-by-step explanation:
To make the iPhone keyboard go away, you just need to tap the screen outside of the text field or tap the 'Done' button, if available, on the screen. When you are done typing, and you notice that the keyboard is still present, simply touching any area outside the text input field should automatically hide the keyboard.
In some apps, the text field may have a 'return' or 'done' button on the keyboard itself; pressing this will usually hide the keyboard as well. If the keyboard remains on-screen without any way to dismiss it, there could be a software glitch, in which case, closing and reopening the app usually resolves the issue.