How to purchase Phone/Message notification services?

If your app was not downloaded from the Google Play Store, you can make purchases within the app by going to App > Smart > Featured Services;

If your app was downloaded from the Google Play Store, you can check if there is a related purchase path on the device details page - top right corner > Settings > Value-added Services;

If you can't find a related path, you can go to Scene - Set Automation, select the action to Send Notification Reminder, and the app will pop up a purchase prompt;

If you still can't find a related path, it means that the region your account belongs to does not support these two services.