Actually, it's "I do" and "I don't.."
I have one, it only gets used in emergencies, and if somebody needs to get in touch with me in a public place, they can talk to my voicemail.
You can talk on your cell phone in public as long as you give me my right to blow garlic-onion pastrami belches in your face all day long. It's about as annoying.
All I want for my birthday is a new President!