old cingular sim card?

I am looking to buy a Cingular sim card so that i can put it into an old nec phone mode 525

the purpose is to get out of the emergency screen that i am locked in because i have no sim card in the phone.

I tried my old razors sim car but it did not work i think because at that point my plan became att again when they switched back over as main company's.

And to retrieve old photos inside the phone, will buying a Cingular sim card that i never used or is not activated work for my old phone from 2004/2005


if I buy a Cingular card that I never activated or was never registered to me for an old phone will I be able to.
to add more detail I have used my old sim card it did not work

I do not have a current sim card from att or cigulair as i have been with Verizon for the past 6 years