It’s been a week since I got the Gevey SIM and now I can safely say that it works. Yes I am talking about the Iphone4 Unlock solution using the Gevey SIM . I got hold of a Gevey Sim from e-bay last week, and it works just fine. So for those who have doubts, you are safe to try it. Let me tell you that I am running on iOs 4.3 with baseband 4.10. 1 and it works with Cellone. With the MicroSIM on iPhone I don’t have the liberty to try other networks. 
I am sure it definitely works on iOs 4.1 as I upgraded to 4.3.2 yesterday. Really delighted to get my phone working after a couple of months of using it as an iPod 
. I have not lost any calls and 3G works fine as well with data roaming on. The instructions that come along with the Gevey SIM are very clear and easy to follow. I have linked a video here just in case you needed more assistance. So go ahead guys try the Gevey SIM for yourself if u are struck with a locked iPhone 4.