Cell Phone Ignorance

I had some things to do today, so Dave wanted me to have his cell phone. I told him I didn't need a cell phone to just run to Petco, and what if someone from the station tried to call him. He still wanted me to have a phone, so he gave me his new one. Great, I though. If I see a creepy, suspicious person, I can always get my cell phone out, and ask him how to call the police on him...