To turn the speakerphone on or off
Tap the Speaker button
on the Call screen.The button is blue when the speakerphone is on.
When viewing the Call screen, you can turn the speakerphone off by tapping the Speaker button
again.The speaker is turned off automatically when the call ends.
WARNING!
To avoid damage to your hearing, don't hold the phone against your ear when the speakerphone is turned on.