Any way to stop phone from vibrating when on a call?

It happens all the time.

I'm on a call, thoroughly enjoying life, in a state of total and utter relaxation.

Then: BZZTZTZTZZTZZTZZZZZTTZZ!!!!

Right in my ear, the iPhone completely shatters my calm. All because I got a text or an e-mail.

I appreciate the notification, and I have my iPhone set to vibrate for texts and e-mails because when the phone's in my pocket the vibration definitely helps to notify me, but maybe the tone/chyme is enough when I'm on a call.

And by maybe, I mean definitely. There is no good reason I can think of why I'd want this sneak attach vibration terrorizing the side of my skull. It's simply unpleasant and often times unnerving.

Does anyone know if there's anything that can be done about it? I've searched, but have come up with nothing apart from completely disabling the vibrate option, or remembering to always switch the phone to silent (with vibrate off for silent in the settings) every time I take or make a call, which is awfully inconvenient and still results in occasionally forgetting, relaxing and then being punished.

Maybe there's a setting I'm missing somewhere?

Thanks for taking the time.

Darcy