Dell Mini 3v - Manual (Page 72)

The following are the available settings:
SMSC
Select this setting to enter the short message service center number. Contact your service providers for this information.
Tap OK to save and exit.
Expiry Time
Select this setting to set the short message expiry time. The available options are One Hour, Twelve Hour, One Day, Seven Day, and Unlimited.
Delivery Reports
Select this check box to request a delivery report for each message you send.
Forward Settings
Select this setting to show or hide the sender when forwarding messages.
Delivery Reports
Select this setting to request a delivery report for each multimedia message you send.
Request Read Reports