Zte T230 User Manual page 44

ACCESS DRAFT MESSAGES
Draft messages are automatically saved when you exit the message
application without having sent the message. If you have any messages
in Draft status they are marked in red with
DELETE MESSAGES
 Tap Options > Select item(s) to select 1 or more messages to delete.
 If you are in the thread view (all messages) then selecting the thread
by a long press on the listing item will delete all the messages.
 If you are in the Message view, long press on the individual message to
select.
 Select the messages to delete using the methds above and then press
DELETE.
Draft