Hello, I've been searching everywhere and it seems I cant find a solution to my problem. Here's the thing: I'm from Mexico, I've had my iPhone 4 for over 2 years and never needed to unlock it, I'm using iOS 5.1.1 with jailbreak and my baseband is 4.12.01 (I really never knew anything about basebands). Right now I'm living in Spain, and I'm gonna be here for about half a year, so I started looking for a way to unlock my phone, it seems I cant unlock it with this Baseband and the carrier I bought my phone from doesn't do the IMEI unlocks... why? I don't know, they have no idea what I'm talking about when I explain them, I've talked to supervisors and still don't have any solution. I read something about a tweak for changing the IMEI, but I don't know if changing it to some other unlocked IMEI would work. Any advice on this matter? I'm really desperate Thanks!