Zte T230 User Manual page 29

INSERT A PAUSE OR WAIT SYMBOL INTO A PHONE NUMBER
 Enter the phone number on the Dial pad.
 Press Options > Add 2-sec pause to add a Pause
 Press Options > Add Wait to wait for the next key press.
CALL SETTINGS
From within the Dialler, press Options (3 dots icon) > Settings:
Voicemail
Fixed Dialing Numbers
Call forwarding
Call Barring Settings
Additional Settings > Caller ID, Call waiting
Quick Responses