Your IPhones is Developing cracks? Which week was your build?

[preguntonontrac]

WE all know a part of the iphone already sold have been developing cracks, even the black ones. Just doing a little survey for my own info about this.

So.. Your IPhone is developing cracks? if Yes reply with your model and build week! and after how much time you noticed it?

Thanks.

note: if someone can reply also with info about the way of finding out the build week for people who reply to this post.