Well that didn't take long at all. The T-Mobile G1 has barely been officially on market for a week and we're already seeing some of T-Mobile's HTC-made G1 being liberated from T-Mobile's GSM network.
The enterprising folks over at Unlock T-Mobile G1 have managed to figure out how to generate that magical 8-digit unlock code that will free your T-Mobile G1 from T-Mobile's network. The SIM unlock solution requires that you supply Unlock T-Mobile G1 with your G1's IMEI number along with a $22.99 fee. In return, they'll send you an unlock code that will have your T-Mobile G1 surfing any GSM network in the world.
Buyer beware, the T-Mobile G1 features a dual-band (1700/2100Mhz) UMTS radio to hook up to T-Mobile's nascent 1700Mhz AWS 3G network. That means you'll be surfing the wireless web at EDGE-only data speeds should you unlock your G1 and use it with AT&T. 3G networks in Europe, on the other hand, will work just fine on the 2100Mhz band.
Worse yet, an unlocked T-Mobile G1 on AT&T's network won't log-on to Gmail - which pretty much kills the T-Mobile G1's Google integration and Android Market features.
Still, if a T-Mobile G1 running on a non-sanctioned GSM network is the kind of thing that gets your blood flowing, the T-Mobile G1 unlock solution will probably be just the thing for you.
