Price: $100 

Sprint welcomes the first eco-LTE smartphone, combining high-end specs with green-friendly features. LG's handset boasts a casing built from 50 percent recycled materials and bundles an energy efficient charger that automatically turns off when inactive. It's 4-inch panel produces bright and sharp imagery, where as its dual-core CPU delivers speedy results. As Sprint expands its LTE market within the next year, expect the Viper 4G to be the go-to phone for tree huggers.