Nokia N93 - Manual (Page 54)

Messaging
53
Other settings
Press , and select Messaging > Options > Settings >
Other and from the following:
Save sent messages —Select whether you want to save a
copy of the text messages, multimedia messages, or e-mail
that you send to the
Sent folder.
No. of saved msgs. —Define how many sent messages
are saved to the Sent folder at a time. The default limit
is 20 messages. When the limit is reached, the oldest
message is deleted.
Memory in use —If a compatible memory card is inserted
in the device, select Phone memory or Memory card to
save your messages.