Your progress
Where your progress is kept, starting over, and moving to a new phone.
Where your progress lives
Your finished lessons and every word in My Words are kept on your phone, and only there. There is no account to sign in to and no cloud copy.
Starting over
Open Settings and, under Your data at the bottom of the page, tap Reset all data. Speeku asks once more, then deletes every lesson you have finished and every word in My Words.
Starting over cannot be undone.
A new phone
Because your progress lives on your phone, it cannot be moved to another one, and it is removed if you uninstall the app. The course itself is yours, though: install it on your new phone with the same store account and every lesson is there for you. Paying for Speeku explains how.