Can I upgrade my unlocked iPhone?

[Wonginit]

Ok here it is. I am a newbie as well. I got an iPhone in China and its the unlocked version. The dude that sold it to me told me not to update it to 3.0. Something with how if i verify it, Apple will lock my phone or something. Can anyone help?

[Moi un Mouton]

Yes, you can upgrade it and then unlock it yourself. The tutorials on here and on iclarified.com tell you how to do that.

[DanielNTX]

Maybe he can't upgrade it. Because it's one of these China iphones: http://www.macrumors.com/iphone/2009/06/29/counterfeit-iphone-3gs-becoming-more-convincing-at-first-glance/

[megamanbnmaster]

If it isn't a sanzhaiban phone, and it's actually a real iPhone, then you can upgrade to 3.0 Then just use redsn0w or pwnagetool to unlock and jailbreak it.

Most likely it was a locked phone and it was Jailbroken and unlocked through the jailbreak.