There are a few ways to get the black heart emoji on your iPhone. The first way is to use the keyboard shortcut ⌘-I. The second way is to use the search bar in the top left corner of your screen and type “black heart” into the search box. The third way is to use a third-party app like Emoji4u or EmojiX. Finally, you can also get the black heart emoji using a web browser like Safari or Chrome.