Haier HC-C300 User Manual page 16

You can select the template messages to send directly.
Or press the option menu, editing or managing the message.
Delete all:
You can delete all kinds of messages in this menu, but you need enter the phone code number before use this function.
Message settings:
This menu contains: Storage location, Priority, Delivery report, Deferred delivery, Validity period, Auto save, Auto delete, Edit SMS on call reject.
You can set this menu as what you need.
Memory status:
View the amount of memory currently in use for messages in phone's memory and RUIM card.