Not sure ATT could help, where is the sim from and what are you trying to do with it?
Is the PUK code related to the phone brand or model?
The PUK code has nothing to do with your mobile phone’s brand (i.e. Nokia, Motorola, Samsung, Nextel, Sony-Ericsson, LG) or model. The PUK is only tied to the SIM card.
What happens if I lost or forgot my PUK code?
If you are a postpaid user (Globe, Smart, Sun Cellular, Verizon, T-Mobile, Orange or AT&T), your cell provider may be able to provide you with your PUK code. Just call them up, authenticate your identity by answering some questions and they will give you the PUK for your SIM card. This is easy because the telco can verify you as the owner of the SIM card or the mobile number.