As of now developers can get a fully SIM-unlocked T-Mobile G1 with unlocked bootloader that allows flashing of custom Android builds (no need of signed system images anymore). Called the Android Dev Phone 1, the special device will be available to all developers registered at the Android Market from 18 international markets including US, UK, Germany, Japan, India, Canada, France, Taiwan, Spain, Australia, Singapore, Switzerland, Netherlands, Austria, Sweden, Finland, Poland, and Hungary (with more to come soon).