My iPhone 6 has a gap on the top?

Should I be worried because a bit of light from the phone is coming out

Yes. It could possibly be a defective iPhone. I would take it back and demand for a switch. It's like, why would you pay so much for something you really want and end up being something wrong with that. That is bull ****! I would definitely take it back and switch out iPhones.

That you will not find out until you ask. If this gap is due to you dropping the phone, you will NOT get an exchange, unless you have Apple Care+ which handles accidental damage. Regular Apple Care is just for warranty issues ONLY.

I had it since the release date though…
Am I able to return in back and get exchanged for a new one?My iPhone 6 has a gap on the top - 1