Can the new G1 phone be used with AT&T? Unfortunately you need an unlock code for the G1 so that you can use it with your ATT service or any other service. Do you want to know how to unloke the new T-Mobile G1?
If you want to konw how to unlock your G1 you will need to get an unlock code which you can get here - It's not free but it is worth to be able to use the TMobile G1 with your ATT service. This way you can turn your G1 into an ATT G1!