Iphone 7 plus bought from apple 3 months ago has a rattle noise when i hit the top or back of the phone?

Everything works fine with the phone but i've noticed when i put my phone down the side sounds like a spring and the back too. It dosent make noise unless i set down my phone. I heard this is normal its because of the dual cameras on the 7 plus and anothe one of my friends with the 7 plus has something similar. Is everything ok?

Are you sure everything works fine including both cameras? Does it rattle when it vibrates?

Yeah

The camera mechanism moves on a spring for focus and has multiple lenses. This causes that rattle.

I don't see any harm in getting it checked over by an Apple Store, or at least contacting them through Apple Support on Twitter if you have an enquiry.

Take it to an Apple store or wherever you got it and talk to them. It should not rattle.