Things You'll Need:
- Current SIM card
- Cingular cell phone (not activated)
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Step 1
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.
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Step 2
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.
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Step 3
Slide your SIM card into the slot on the used cell phone. All Cingular cell phones use compatible SIM cards.
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Step 4
Turn the used cell phone on, then turn it off and back on.
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Step 5
Check the phone by making a call, or calling it from another phone. Your used Cingular cell phone should now be up and running and ready to go.












