whats is the meaning of rfb in i phone 6s box???

Why it is not new?

The phone in the box is 7 plus.

It is, but its not a new phone.

The iphone has a lot of fans in iran,

But because of the ignorant rulers of iran,

Peaple also have to miss this superior technology.

Is my phone not new?

But the warranty date is 13 july 2018.

That's right , but my question is just that my phone is refreshing with this box?

Thanks

My purpose from Refreshing is word "RFB" on box.