If you're a former Cingular Wireless customer, you'll now need to purchase a phone that works with AT&T, the carrier that purchased Cingular. Cellular Country has the web's richest selection of used Cingular/AT&T cell phones that you can use with your existing plan. You'll simply need to pop the sim card out of your existing Cingular or AT&T phone and place it in your Cellular Country phone. No calls, no trips to retail stores. It's that easy. You'll be ready to switch to your quality used Cingular/AT&T phone the day it arrives.