Sprint(s s) on Thursday began taking pre-orders for the LG G Flex, a curved Android(s goog) smartphone with self-healing properties. The phone won’t be available until January 31, but those interested can place their order on Sprint’s product page for the phone. The unique handset costs $299 with a 2-year contract. It may pay to place the order early if you’re set on this phone: Sprint is including a $59 Quickwindow Folio Case with pre-orders for a limited time. The handset is designed to use Sprint’s Spark service, which can intelligently route traffic over different frequencies for optimal bandwidth.