Well, finally, i took my Iphone 5 to a local apple service center in Braga, Portugal, and since the invoice was dated 5 Feb 2013, they sais they need to check the warranty status.
Then, they started saying the phone was sent out originally to the Luxembourg market in Oct 2012, and that this didn't match.
They said that apple might not give me the warranty because of that situation.
I then checked with the guy i bought the iphone from, and he told me that it came from a batch of phones he did buy in Luxembourg to re-sell in his shop. He told me not to worry.
Luckilly, after 5 working days, they called me saying " i don't know how this is, but apple sent a replacement phone for you. Giving the inittial situation, we really were not expecting this..."
Well, went to pick it up yesterday afternoon, and now i have a new (a.k.a. refurbished) Iphone 5.
Thankyou, E.E.C, for the 2 year warranty!!!
But still, 10 pages of post in this thread, and still Apple won't recognize the screwup they made with this small button. Maybe this will be the last iphone i'm gonna own...
Good luck to all of you guys!