Please note that free user accounts do not sync anything to cloud storage and rely on local storage only. Still, all your existing photos and presets should still be there. However, since you've reinstalled the app and signed in on another device, your photos and presets will not exist because they were not synced to cloud storage.
Could you double check if you had "Back up all data..." selected once you created the backup of your previous phone. If not, could you give it a try again, and before you start to create backup, force-quit Lr on your device...- Guido/ Lr Mobile QE