For the Samsung Note 9 newest OS update. Customer service FINALLY figured out the problem. And it worked for about a month. Then Samsung sent out a new OS & the reminders are firing even more randomly than before. Just emailed tech support AGAIN. I have to say, I do love the app & tech support is good, but response time is slow. But unless developers can find away to keep it working no matter what update the phone developers come up with, I may have to find a more Google friendly app.