I'm in a similar situation ... mistakenly upgraded iPhone 4 (ATT) to 4.3.4 and now having to unlock it for another carrier. The baseband is 4.10.01
So from what I understand based on the posts above:
* jailbreak has to do with the firmware. 4.3.4 means tethered jailbreak only. I WILL be able to JB this phone
* unlock has to do with baseband. I WILL be therefore be able to unlock this phone once I jailbreak it
* I can use pwngetool to jailbreak and ultrasn0w to unlock
Am I correct in this understandings?
Another question:Is it possible to downgrade to version 4.3.3 ? How? If I do, does that mean that I'll be able to have a unlocked, untethered JB iphone 4 then?
Sorry if I misunderstood the replies and thanks in advance for your clarifications.
br,
HT