Right lower corner of my iPhone 6 clicks when I press it! Can I claim it in warranty?

So I bought my iPhone 6 from Belgium. After using it I realised that the right lower corner of my phone ticks when I press it.

I don't really know what to do. I'm thinking to send it back. I'm currently in Pakistan. Can I claim it in warranty and can Apple replace it with a new?

What weird is how can they sell out faulty phones!

Im very disappointed!