What network is my iPhone 3GS locked to?

[LucasG]

A while ago I purchased an used iPhone 3GS, I was aware it was locked to some network but at that time the US wasn't selling unlocked phones so decided to get it anyways and I currently run it unlocked with ultrasn0w, the thing is it's not the same experience. You do experience more problems than usual on a unlocked phone as so much hacking has to go in it.

With the new official unlock services flying around, I was hoping I could see where it is locked to as it might actually be one of the unlockable networks, but who knows, it is probably AT&T and there is no solution to that, I'd still like to know where it is locked at.

Any ideas on how to do this without restoring the phone and stuff?

 

[jTeeh]

where did you get the iphone from?
If it's in the US, I think AT&T was the only carrier of 3GS.
You can also try to downgrade the iOS and try to unlock it again

 

[LucasG]

I don't know, I bought it in Costa Rica (which is where I live), I never asked where it was locked too, I had pretty much assumed it would be impossible to ever do it.

 

[jTeeh]

http://www.iclarified.com/entry/index.php?enid=4253

Try this guide. As I said earlier you need to downgrade the iOS to 4.x.x in order to jailbreak untethered, which is required to do the above steps.
I don't see why restoring / resetting the phone would be an issue for you. You can always back it up before doing anything.

 

[LucasG]

I already have it unlocked, I know how to unlock it, not looking for tutorials on how to do so, I'm interested in finding out to which carrier is the phone locked.