LG GD570 - Manual (Page 71)

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When you have both an active call and a call on
hold, you may switch between the two calls.
To switch between the two calls:
During the call, press the 1 Options soft key,
highlight Swap Calls, and press .
The active call is placed on hold and the other •
call is activated.
Press 2 to disconnect the active call.
Note: You can also easily swap calls by using the
Navigation key. Just press up or down to switch
between the calls.
Using the Speakerphone
While on a call, you can use your Speakerphone by
following these steps:
Press the 1 Spk. On soft key.
Press the 2 Spk. Off soft key to turn the
Speakerphone off.