yeah, just take the SIM card from your new phone, and put it into your old one.
I have the same problem! i had sprint and i loooved my phone. so i got cingular service and stayed with my sprint phone.
to get the SIM, go to the back where the batteries are. it's that little tiny card. take it out, and put it in your old phone! should work great!
hope this helps (:
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