Uniden 1380 - Manual (Page 14)

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Flash
Press the FLASH button instead of using the hook switch to activate customer
calling services such as call waiting or call transfer, which are provided by your
local phone company.
Redial
Redial the last number you called by pressing the REDIAL button after you get a
dial tone.
Note: The REDIAL feature holds in memory the last phone number
you dialed (as many as 3 digits). If you pressed any numbers after
dialing the phone number, (for example, when accessing a voice-
menu system) those numbers also are redialed.
IMPORTANT: In the event of a power outage, your phone will still
be able to make and receive calls, however, the speakerphone and
answerer will not be operational.
Mute
1. Press the MUTE button to mute a call, the MUTE indicator will light up. You
will still be able to hear the calling party but they will not be able to hear you
speaking.
2. Press the MUTE button again to unmute the call.