T-Mobile G1 unlock possible; Android Community celebrates with giveaway

[Charlie]

I unlocked it because there's no TMo in Belgium.
And I want to use it with Proximus (national carrier) and be able to use it with other cards when I go abroad.

Now, I can say that once you've set-up the network specifics, it works like it works on the TMo network. It just takes a little surfing to get everything collected before it works flawless.
3G, 2G, even syncing. As long as you have a valid, working data channel, it doesn't matter which carrier you use.

Just have to fiddle a bit more to get MMS working