Paying $70 to $100 or more a month for smartphone service is the norm if you're signed up with one of the Big Four U.S. carriers. But it doesn't have to be that way. Republic Wireless is offering unlimited 4G LTE, voice and text for $40 a month with the purchase of a Motorola Moto X for $299. The catch? The carrier wants you to use Wi-Fi for most of your data and voice needs, but you can tap into Sprint's growing LTE network at any time. For those looking to enjoy cutting-edge smartphone features for a low monthly price, the Moto X for Republic Wireless is a no-contract steal.