To Turn The Speakerphone On Or Off - Google Nexus One User Manual

Placing and receiving calls

To turn the speakerphone on or off

S Touch Speaker.
The Speaker button lights up green to indicate that the speakerphone is on.
The Speaker icon appears in the Status bar and the sound from your call is played
through the phone's speaker.
When viewing the current call screen, you can turn the speakerphone off by
touching the Speaker icon again.
The speaker is turned off automatically when your current call ends.
Warning! To avoid damage to your hearing, do not hold the phone against your ear when the
speakerphone is turned on.
To switch between a Bluetooth headset and the phone
When a Bluetooth headset is paired and connected to your phone, you can conduct all
calls on the headset for hands-free conversation.
For details about configuring the phone to use a Bluetooth headset, see "Connecting
to Bluetooth devices" on page 71.
When using the Bluetooth headset during a call, the current call screen has a blue
border and the Ongoing Call icon turns blue in the Status bar.
S Touch the Bluetooth icon to switch from the headset to the phone or vice versa.
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Nexus One User's Guide