unlocked 2.0.2 iphone 3g, how to jailbreak

[pcharouz]

I recieved an unlocked 2.0.2 firmware iphone 3g, it works with any normal sim (tested ATT 3g, and O2 3g in europe)

I am scared that if I update to 2.2 it will break the unlock, should I be worried about this? I have no idea on how it is unlocked, since i could not find any info on unlocking the iphone 3g via software.

Could someone point me in the right direction? I've been a WM user for a very long time, and I just though I would try what all the fuzz about the iphone is, but my experience with the 2.0.2 firmware are very bad, it crashes more than WM! and I cant even tether my internet connection...

Will this work? How To: Jailbreak iPhone 2.2 (Preserving Baseband) - Mac OS X Edition | The iPhone Blog
I really dont want to break the unlock, but I hate that I cant even install a bunch of apps from the appstore since they require 2.1.
Is there anything similar as above for windows? I have a friend with a macbook, but I have a windows pc.

off-topic: is there any way to have gmail set up as push email?

 

[Jeremy]

I would not do a thing until you figure out how your phone was unlocked. Where did you purchase the phone? And right now there is no way to get gmail to push.

 

[pcharouz]

it came from o2-CZ, but there is no way of figuring out how it was unlocked, I am thinking it was unlocked officialy with the unlock code from o2. And thanks for the reply

 

[Jeremy]

Yeah if you want to update a official unlocked phone you should have no problems. Just update via iTunes then and all should be well.

 

[pcharouz]

and what about jailbreaking via windows? And won't it ask me for the code again if I upgrade the baseband? (I don't have it)

 

[Jeremy]

I don't think it will update the baseband knowing that your phone is officially unlocked. For jailbreaking you would use the latest QuickPwn for Windows.

 

[pcharouz]

Is there any way I could test that it is officially unlocked?

 

[pcharouz]

or is there any way I could back up my current firmware/baseband if something goes wrong?

edit: I updated and everything went fine, I also jailbreaked with quickpwn, thanks for all your help!