ZTE Grand X Plus - Manual (Page 68)

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End a Call
During a call, touch on the screen.
Answering or Rejecting Calls
When you receive a phone call, the incoming call screen opens,
displaying the caller ID or the information about the caller that
you've entered in the Contacts app. You can answer or reject the
call, or reject it with a text message.
Answer a Call
When you receive a phone call, slide down to answer the
call.
NOTE:
To silence the ringer before answering the call, press the either
end of the Volume Key.
Reject a Call
When you receive a phone call, slide up to reject the call.
You can also slide up to reject the call and select a preset
text message or edit one to send to the caller.
NOTE:
To edit the preset text response from within the Phone app, touch
> Settings > Quick responses.