Same thing happened to me right now I just bought this phone yesterday. I also have the green one and we have the same exact spot of the crack, completely identical. Now, I'm also planning for a replacement. I hope they'll replace it with a new one, even though it's just a not so serious crack. I'm from Ph and I hope they sony has a good service here.
+Carlo Castillo Honestly they should. I got mine replaced with minor problems. Obviously, they'll try to say that you broke it and that there is no prove that it was faulty. But you have to stand on your ground and demand a replacement, but don't be rude. If the phone is cracked, then it will no longrr be waterproof. Goodluck dude.