How to block all incoming call?

I have Lenovo A880,
I want to block every incoming call but don't know how. What I expect about this call block is when someone call me, it seem like my phone is currently turn off.
I have search on Google, only but they only suggest Android based application where only block when I blacklist certain number phone.

Guest

Turn the phone off or on airplane mode or set it to silent. Or you could change your number.

Bill