I have an iPhone 4 running 4.2.1 with a baseband of 03.10.01. I believe that Gevey Sim is my only option for an unlock at this point, but I want to upgrade to 5.1.1, so I had a couple questions: 1. If I upgrade to 5.1.1, should I keep my 03.10.01 baseband, or let the baseband get upgraded? 2. If I let 5.1.1 upgrade my baseband, what will it be updated to, and is the newest baseband unlockable by any means (i.e. - Gevey Sim)? 3. Is it possible that 03.10.10 will be supported by Ultrasn0w at some point in time in the future? In other words, would it be wise to keep my older baseband because it may be supported before newer basebands? Or is it unlikely that it will ever be supported? tl;dr: I'm trying to ascertain if I should preserve my baseband or not, and why. My iPhone 4 is currently jailbroken on 4.2.1, but it's (obviously) not unlocked, since I have 03.10.01 baseband. However, I may want to unlock in the future (or buy a Gevey Sim), and I'm trying to decide the best course of action (if there is one).