If you have previously registered and backed-up your data from SQUARE ENIX BRIDGE (by tapping "Other" from the in-game "Menu" and then tapping "Back up data"), you can continue playing from your previously saved data. If you are unsure of this procedure, please refer to
this article.
Download the app on your new device and in the title screen tap "Options" and then tap "Transfer Data." Follow the onscreen instructions to restore your save data.
* Please be advised that if you did not take these steps and reinstalled the app, you will not be able to carry over your previously saved data.