T-Mobile

Yes, the T-Mobile G1 can be unlocked and run on AT&T's network, but not without limitations.  Better yet, Google is now offering the Android Dev Phone 1 a SIM and hardware-unlocked G1 for $399 (free shipping to the US).  Unlike retail devices, the bootloader on the Dev Phone 1 doesn't enforce signed system images, enabling you to flash custom Android builds to the device (plus you get the cool custom Android logo design on the back).  To order one, you have to register as an Android developer in the Android Market (one-time $25 setup fee).  Now you can finally have a test environment for all those mobile apps you've been developing!  Haven't been coding anything?  Well, what are you waiting for?  Here's Hello, Android! to get you started.

Representatives from T-Mobile, HTC, and Google all kicked off the official launch of the first Android phone, T-Mobile's G1 (previously known as the HTC Dream) with a live event today in New York City.  Here's a round up of the day's activity.