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When you receive a call, you can either answer the call or silence the incoming call alert.
1. Silence the incoming call alert
Press the upper or lower part of the Volume key when you get a call. The incoming call alert is silenced and the call continues until it's ended or diverted.
2. Answer a call
If the screen lock is turned on, press and drag the circle right.
3. End call
Press the end call icon.