When Samsung Pay finally launches in the U.S. later this month it will only work on a few recent flagship Galaxy phones. However, the company says it plans to expand beyond high-end devices to cover cheaper models as well, though it may be a while before that actually happens.

Speaking to The Korea Herald, Samsung’s mobile chief JK Shin said the mobile payments app “will gradually expand” to the company’s cheaper devices. Samsung Pay also relies heavily on magnetic secure transmission (MST) technology, which isn’t included in most handsets that simply offer NFC.

Samsung Pay is set to launch in the U.S. on September 28, and it has already racked up over 500,000 registrations in the country according to recent reports. The service is also up and running in South Korea, where the company says roughly 25,000 people are signing up daily to use the mobile payments app.

It’s unclear how popular how Samsung Pay will be in the U.S., where competing services like Apple Pay and Android Pay already have a head start. But for Samsung fans this could be the best option out there, especially if the company can get it working on cheaper devices as well.