A free program for Android, by Nguyễn Đắc Phúc.
SMS Scheduler can help you with automatic SMS sending at any time in the future. You don’t need to worry about forgetting or being busy on a certain day or time. The app will automatically send SMSs to your contacts at the desired time.
It is a very simple and easy-to-use app. All you need to do is to select the time and add the contacts you want to send SMSs to. Then, you just need to click “SMS Scheduler” and the app will do everything for you. You will be able to view the status of your messages and the history of failed messages. The app will automatically notify you about the failed messages.