Mobile phones is the life line of the new generation. How to Activate a Cingular Cell Phone. Activating a Cingular cell phone is an easy process. Cingular is one of the few cell phone companies that still use a SIM card in back of each phone. Remove the back of your current Cingular cell phone and look for the SIM card. This might be under the battery, or right above the battery.Take the back off
. the used Cingular cell phone and look for the SIM card slot. If there's a current SIM card, take it out.Slide your SIM card into the slot on the cell phone. All Cingular cell phones use compatible SIM cards. Turn the used cell phone on, then turn it off and back on. Check the phone by making a call, or calling it from another phone. Your Cingular cell phone should now be up and running and ready to go.
