LG U8150 User Manual page 180

Messaging
1.9.2.3 Auto retrieve
This menu allows you to determine whether to automatically
download an MMS message when an MMS notification message
arrives.
1.9.2.4 Validity period
This menu allows you to configure the term of validity for a message
when transmitting an MMS message.
The message would be saved in the MMS server only for the
configured term.
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U8150 User Guide