EmojiSwitch now allows you to get your old emoticons back.

Wish your current device supported Phone 8 or Phone X emoticons?
Emojis for OS 12 can be installed even on a Phone Xs by using Emoji Switch.

This app offers numerous emoticon packs for download, is essentially a changer.

You must have root access in order to utilize the Emoji Switcher. Otherwise, it won't be able to replace the installed emoticons on your device.

Here is a list of some of the available packs:
EmojiOne, AOSP, Phone X, and more emojis!

This app also features the most recent OS 12 emojis, but it also has older OS 11 one