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I think any time there's more than 2 people sitting at a table, it's some sort of business meeting. Especially when there's a bluetooth headset involved.
Seriously, it's just an obvious ploy to feign importance, when you're really not that important. I think they should make combo packages of really gaudy cell phone accessories like bluetooth + leather cell phone wallet and bluetooth + extra battery pack case. You should get a deal if you are paying to look that lame.
It's impossible you are so important you can't put the phone to your head. Nobody needs to talk on a phone that much.