Boy do these Android Users move fast. We have news that the T-Mobile G1 has been jailbroken. Meaning full system access and read and write capabilities have been obtained. We have yet to try the method but its supposed to be quite easy.
Here are the basic steps (via modmygphone):
Turn on WiFi in the G1 (Settings > Wireless Controls > Wi-Fi). Make sure you're connected to a network....
We already showed you guys how to unlock the T-Mobile G1. Now we're catching word that it's possible to use the G1 with no activation with no hackery or tomfoolery necessary. Simply, when you get the G1, insert an already activated T-Mobile SIM card (preferably from a very nice friend), go through the sign in process, and switch on Wi-Fi. According to the enterprising user who did this, you can...
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