If you get a new iPhone or iPad you can download the app, then restore your purchases for free.
- Download the correct app: https://itunes.apple.com/app/id871132166
- Open the app and wait for a few seconds. Try to send an emoji that's not free (e.g., from the Funny gallery).
- If an alert asking for a purchase pops up, it means no purchase was restored yet.
- Manually restore your purchase by going back to the main screen, then tapping the Info button at the upper left-hand corner, then tapping on Restore Previous Purchase button.
Important: please make sure you restore using the same Apple ID you've used to make the purchase with.