Calls Go Straight To Voicemail

[Avalon60]

I have just bought the Xiomi Redmi 3s and after setting everything up when it receives a call the call goes straight to voicemail. What setting should I change to solve this problem

Also do you swipe the red button up or across towards the green button. On another Chinese phone the red button is swiped across to the green button

 

[MarkyO]

To answer a call? Swipe the green button upwards.

 

[Avalon60]

Thanks