Samsung's latest and greatest smartphone, the Galaxy S 4, is making a big move into the US today with an online arrival at Sprint and in-store availability at AT&T. If you're a Now Network subscriber and happened to miss out on the carrier's pre-order action, you might want to make some quick moves onto Sprint's website in order to secure your new handset, which goes up for sale at midnight Central Time. In a not-so-cool move, however, only those porting their number to Sprint are eligible for the carrier's $100 price break, which means all of you who've stuck through the dark days of EV-DO will need to pony up $249.99 for the Galaxy S 4. Meanwhile, if you're aching to lay your hands on Samsung's 1080p handset, you can finally get some gratification, as AT&T is now offering the smartphone for in-store purchase and play. Here, you'll pay $199.99 for the handset, and while it's potentially more expensive, at least AT&T's pricing scheme doesn't involve fine print shenanigans.