[Matt_C]

Still pondering getting an iPhone 3G from Italy, as I want to continue using my T-Mobile (UK) sim, and after having (still have) a 2G and having to do the unlock/jailbreak proceedure every time I upgrade the firmware, I really can't be arsed waiting for unlock cracks to be done for new firmware - so much easier to just stick my T-Mob sim into an Italian iPhone 3G and have it function as it would if it were on O2....

However, a thought just crossed my mind;

YellowSnow is needed to unlock the baseband on the iPhone 3G, which keeps getting relocked by Apple with new firmware, hence it needing to be cracked again...

How is the baseband different on the Italian iPhone's?

Would upgrading the firmware on one of these, on a computer in the UK registered to me, an iTunes user in the UK, lock the baseband of an Italian iPhone?

I would still want to jailbreak it, to use the apps I have grown accustomed to, how would this affect the baseband for an "officially unlocked" iPhone?

[ma1234]

Officially unlocked iphones remain unlocked even after upgrading from a UK user of itunes.
The baseband downloaded is no different than locked phones and it actually appears to me that the phone is locked after the upgrade has finished.
After the upgrade, the phone through itunes is automatically unlocked and activated, Apple presumably maintain a list of all officially unlocked phones as a signal or file or something is sent to the phone via itunes to unlock the baseband.
Jailbreaking is not affected in any way as you are not altering or touching the baseband, you can just jailbreak as you normally would.