The iPhone SIM works in other phones like any other AT&T SIM, so if you had an unlocked tmobile G1, it would work. If the G1 was still locked, it wouldn't work, just like any other SIM. -Taylor
Now that we've thrown 'em off the trail, use the form below to get in touch with the people at Engadget. Please fill in all of the required fields because they're required.
The iPhone SIM works in other phones like any other AT&T SIM, so if you had an unlocked tmobile G1, it would work. If the G1 was still locked, it wouldn't work, just like any other SIM.
-Taylor