Relative to what?
Anyway, those who care enough about fashion will remove the case and only put it on when they need a little extra reception. Or, just as likely, they will flock to the third-party vendor who sells micron-thin transparent cases. That vendor is gearing up as we speak.
Or use the headset and put the phone away in your pocket, the way God intended phone calls to be made.
What? I'm not talking to _you_!
They hunch over slightly, and exaggerate the act of speaking into it... visually emphasizing that they're not just casually strolling along talking to themselves.
I know when I'm listening to comedy audio podcasts and can't help laughing, I make sure I'm holding an in-ear bud in place in my ear, or looking at the blank screen of my phone.
We're a silly lot.