Other settings
Select Menu > Messaging > Options > Settings > Other and from the following
settings:
Save sent messages—Select to save a copy of every sent text message, multimedia
message, or e-mail to the Sent folder.
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Number of saved msgs.—Define how many sent messages are saved to the sent
items folder at a time. When the limit is reached, the oldest message is deleted.
Memory in use—Select whether to save messages to the phone memory or
memory card.