Got one of Samsung's newer smartphones? Most likely, you can use it to make purchases across the US: as promised, Samsung Pay has launched Stateside. The technology lets you buy goods most anywhere that accepts card- or NFC-based payments, so you probably won't have to fret about bringing out your wallet at the local shop. If anything, the big challenge is getting the exact combination of hardware and credit cards needed to make this work. You'll need a Galaxy S6, S6 Edge, S6 Edge+ or Note 5 running on one of four big US carriers (AT&T, Sprint, T-Mobile or US Cellular), and you'll need an American Express, MasterCard or Visa card issued through large banks like Bank of America, Citi or US Bank. Don't expect to pay for snacks with your credit union card and a Verizon phone, then. This is still a big deal if you're a Samsung fan, though, and the company is promising broader support over time.