Activating the emoji keyboard on Apple iPhone devices is very simple. First, check to see if your device has the latest version of iOS updates.
Follow the 6 steps to activate emoji keyboard on iPhone
Step 1: Tap the Settings icon and then General.
Step 2: Under General, head over to the Keyboard option
Step 3: tap the Keyboards submenu.
Step 4: Select Add New Keyboard to open a list of keyboards available
Step 5: choose emoji and use it
Step 6: You have now activated the emoji keyboard to use while texting.
To use the emoji keyboard, open any app that allows you to type text, such as Notes, iMessage, or Facebook. When tapping on a text entry field, you will see a globe on the left-hand side of the space bar. Select the globe, and the emoji keyboard will appear. Along the bottom of the keyboard, you will see different emoji themes. By swiping left or right on each theme, users will see there are additional emojis to choose from. The symbol on the left, a clock, shows the emojis that were used most recently.