Sprint (NYSE:S) recently announced that it will launch the upcoming LG Viper 4G LTE on Earth Day or on April 22. The upcoming device will have a price tag of around $100 with the typical two-year service contract and a mail-in rebate of $50. The LG Viper 4G will be the first device to use the 4G LTE network of Sprint and is already available for pre-orders. Consumers who pre-order the device may receive it two days before its official release date in the market.