In a new promotion for the United States, Apple is now offering free next-day shipping on all iPhone models purchased from its online store.

It’s unknown how long the promotion will last. There is a limit of two iPhones per customer for the shipping offer.

While the store usually offers free ground shipping for any order over $50, the free overnight shipping seems to be another step in Apple’s more aggressive promotion of the iPhone line.

Along with the recent introduction of the “Why iPhone” promotional page, Apple made sure to boast that the iPhone snagged the top spot in the wireless smartphone satisfaction survey from J.D. Power and Associates for the ninth straight time.

The company also made sure to make news before and after the introduction of Samsung’s Galaxy S IV earlier this month. Apple’s Vice President of Worldwide Marketing Phil Schiller blasted Android in an interview before the introduction of the handset.

And almost immediately after Samsung introduced its latest and greatest hardware, Apple came out swinging with a promotional campaign that touted the iPhone’s positives.