LGs curved G Flex smartphone will be available on T-Mobile starting February 5th. At full retail, the G Flex costs $672, but T-Mobile expects that most customers will buy the device through its financing plan. Going that route, you can get the G Flex for $0 down and 24 monthly payments of $28. LG is also attempting to sweeten the deal by giving away six free months of Netflix streaming to G Flex buyers.