Is it unlockable?
I'm looking into buying an iPhone 4 from a family member. I understand that you can only unlock certain basebands however. Is there any way I can instruct them to see what their baseband is to determine if it's unlockable?
Also, this article is pretty recent, and I couldn't find anything else, so I'm assuming this information is up to date (with the exception of the tethered jailbreak only clause).
Edit: as a seperate question. If it is at iOS 5.0.1 and an unusable baseband, is there anyway to get the baseband back to the old, unlockable one? I'm pretty comfortable with fooling around with this stuff, but I have only really done it on the android side. Never really messed with iOS past the standard jailbreak.