unlock att network from a motorola t721

I used to be an ATT subscriber but I migrated to Cingular. I cracked the screen on my cingular phone which was also a T721. When I placed the sim card and battery into the ATT T721 it asks me to enter a subsidy password. ATT verifies that it is asking me to unlock the network, however they say they don't have that info. Can anybody help?

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Your phone needs to be unlocked.
You can:
1. Call your local stores & see if anyone can do it locally
2. Check the advertisement forum here & see if anyone will do it cheap
3. EBAY. seems cheapest, but check feedback & hidden shipping costs. You have to send your phone out, so DEFINITELY check feedback. I am unsure if motorolas can be unlocked with a code, or if software must be used...you may want to research that.

http://search.ebay.com/unlock-code-m...trypageZsearch

4. Search the forums. I found that you won't get it unlocked by Cingular, orange or blue.
http://www.cellphoneforum.net/t149384.html
http://www.cellphoneforum.net/t182856.html