AT&T Prepaid cards on Cingular

I've read in another thread that the AT&T $10 prepaid cards work on
Cingular with 90 day expiration. Is this only for AT&T customers
converted over to Cingular? I'm a Cingular prepaid customer not from
AT&T, but like the idea of locating some $10/90 day cards if they would
work for me.

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only works on the at&t ppd phones... what has probably happened is that att customers say 'well, it works on my cingular phone' not knowing that they do not technically have a cingular phone.....it is still on the 'blue' system.