No. Most stores have a 1 or 2 device exchange policy. The carriers definitely do.
Yeah buying and returning is fine. Most stores do take your ID to prevent you from doing such things so watch out cause they can flag you after a while.
At an Apple store.
Could someone (not me lol) buy an iphone and keep returning and buying another every 13 days until they have stock of the phone they really want?
So buy a 6 until the 6+ of their dreams is in stock?
Don't abuse the system . People like that are the ones who are responsible when company start charging for restocking fee.