Durn Phone

Does someone know where I can get a cell phone that will automatically switch into silent/meeting mode as soon as I walk into work? But when I am in a crowded mall line waiting to buy movie tickets, the phone will switch into high-volume mode? Yeah, I didn't think they existed.

Until actual problems like this can be solved, technology will be worth nothing. Tell me when that will happen please. Oh, and where the heck are my flying cars? I was promised flying cars!