Zte MF633PLUS Manual page 22

SMS General Features
Enter any of the Inbox / Outbox / Drafts to use the tabs at the
bottom of the window:
Read
Reply
Forward
Move
Delete
Save
Cancel
Notes
If you want to select several messages, you can use the
Ctrl or Shift keys (Windows)
New messages cannot be received when the SIM card is
full
The system will indicate the SIM card is full. Messages
cannot be saved until some are deleted by the user.
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Read the selected SMS
Reply to the selected SMS
Forward the SMS to other recipients
Save the SMS on the PC or SIM card
Delete the selected SMS
Save the phone number from the message to
the contacts phonebook
Return to the SMS interface