Sending scheduled text messages on Android devices lets you send messages on certain times in the future, and is best for those who are forgetful. On some Samsung Galaxy devices, Sending a scheduled text message is a default feature, which you can learn how to do so here: How to Send Scheduled Text Message on Galaxy S3
On other Android devices, you just need to do as follows to easily send scheduled text message on Android:
1. Download and install Text Later from Google Play (Your device must be running Android 2.2 and up)
2. Tap Schedule SMS.
3. On the opened windows, select the recipient(s), type the message, and tap Message Delivery to set the time* of sending the text message.
* You can change the scheduling interval from the settings menu, and you can decrease the interval to 1 minutes.
4. and the text message will be send at the exact given time and date