MY PHONE IS OFF FOR YOU
I'm reminded of reading someone's new definition of cool "If I'm hanging out with you, I never see your mobile phone". I know I'm, ah, less than faultless with this, but then, I've never claimed to be coo (althought I've tried to do better since reading that particular article). Still, getting one of these might be a good start. Although, reflecting on it a bit, there's a fine line between signalling to someone that they're important to you, and acting like you want brownie points for simple politeness…