Zte Z998 User Manual page 46

Tick the Auto-retrieve check box to automatically download
MMS messages.
Notification settings:
Notifications: Show message notifications in the status bar.
Select ringtone: Choose a ringtone for your incoming
messages.
Vibrate: Make your phone vibrate when a new message
arrives.
Signature settings:
Edit signature: Edit your signature, which can be added
automatically to outgoing messages.
Add signature: Add the signature to all outgoing messages.
NOTE: Touch the Menu Key > Restore default settings to
change all the message settings back to the original.