Huawei P8 Lite - Manual (Page 30)

Calls and contacts
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Answering or rejecting a call
When a call comes in, you can press the volume button to mute the ringtone.
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Drag right to answer the call.
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Drag left to reject the call.
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Drag up to reject the call and send the caller a message.
On the dialer screen, touch > Call settings > Reject calls with SMS to edit the
message that will be sent.
In-call menu
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