There are a few ways to access hidden Emojis on your iPhone. One way is to enable the Emoji keyboard in your device's settings. To do this, go to "Settings" > "General" > "Keyboard" > "Keyboards" > "Add New Keyboard" > "Emoji". Once enabled, you can access the Emoji keyboard by tapping the "Globe" icon on your keyboard until you reach the Emoji keyboard. Another way to access hidden Emojis is to long-press on an existing Emoji on the keyboard. This will bring up a list of related and variations of that specific Emoji. Finally, you can try searching for Emojis in the "Search Emoji" bar at the top of the keyboard, and it will show you hidden Emojis related to the keywords you're searching for. Keep in mind that the availability of some Emojis might vary depending on your iOS version and device model.