Nokia 8310 User Manual page 33

Send DTMF is used to send DTMF tone strings, for example, passwords or bank account numbers. Key in
the DTMF string or search for it in the phone book and press OK. Note that you can key in the wait
character w and the pause character p by repeatedly pressing
Swap is used to switch between the active call and the call on hold,
to an active call, and disconnect yourself from the calls, and Record
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.
Transfer to connect a call on hold
to start the voice recording.
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