Silence vibrator during incoming call

[Mikegs]

Iphone 4

I know it's possible to silence the ring tone during incoming calls by pressing sleep/wake button.

But is it impossible to turn off the vibrator if on silent mode and one wishes not to answer the call (and without cutting the call off - which one press at the sleep button appears to do, just like double press in normal mode)

Thanks in advance

 

[Mikegs]

Sorry... You can just press the volume button once...

 

[cowsrus]

im usually in vibrate mode, i believe if i hit the sleep button it silences the vibrate during a call, almost positive it works on iphone 4, i know it did on the 3g