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What does the handshake icon in the upper left corner of oppo mobile phone mean?

At this point, you set the profile mode to meeting mode. This conference mode, that is, vibration mode, will not ring after the phone call, but it will vibrate. How to eliminate the handshake icon in the upper left corner of oppo mobile phone: long press # in standby interface. Or: Menu-Settings-General Settings-Profile Mode-Standard.