Xperia U Bottom Cap 2-pin Connectors?

[Mango]

What are these 2-pin's found if we removed buttom cap? and as we can see they are three inside..

Can't attach photo, using my android..

[Thommo]

Alex I can't be sure it could be for the microphone as the S and P only have 2 plates in that area so the extra one in the U could be for the different colour lights that aren't on the S and P

[_alexdon_]

Understood,your answer makes sense.