I used to use it. Coverage is the same as regular Cingular native coverage.
As long as you don't go out of the Cingular area then you will be fine. And there are no extra charges. You pay what they say. twenty five cents a minute.
Beware though, time is rounded up to the next minute. If you talk for 61 seconds you are charged for 2 minutes. Of course, this is industry standard.
However, you may want to check out Beyond
GSM, it is a prepaid carrier that
uses Cingular's network and seems to be cheaper.
Beyond GSM | Get Connected -