Can you use AT&T sim card in Google Nexus One?

[Arthas]

Ok I just read that you can insert a simcard into the nexus 1, does it work with an AT&T Sim card?

[Sean]

Place an order: Using the phone with your SIM card
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The currently available Nexus One device is unlocked and will recognize SIM cards from any mobile service provider using the GSM standard, but is incompatible with the frequency band used by the AT&T and Rogers networks for 3G data (see below). Additionally, the Nexus One is incompatible with CDMA networks such as Verizon and Sprint.
We are working hard to provide Nexus One phones optimized for the Verizon network - please stay tuned. The Nexus One for Verizon will not be a GSM device, so it will not be compatible with T-Mobile, AT&T, or other GSM networks.

The Nexus One's antenna supports four GSM radio frequencies (850/900/1800/1900) and three 3G/UMTS Bands - 1/4/8 (2100/AWS/900). These cover most major GSM mobile providers worldwide; however, the 3G band used by AT&T and Rogers is not supported. For questions about the bands supported by your mobile service provider, please contact your provider directly. You may also consult a list of GSM coverage worldwide that is maintained by the mobile trade organization GSM World.

Using the phone with your SIM card : Place an order - Nexus One Help