I bought a second hand iphone 4 thats not activated. I cant get past the apple ID and password prompt. And I dont kow who the previous owner was. But I dont know what iOS version it is. I read somewhere that I can jailbreak it with redsn0w since it can detect the iOS and doesnt matter what iOS version it is. I just want it activated to be able to make calls. Will jailbreaking do this? If so what are the steps?