Sprint is currently offering 50% off iPhone X when you add a new line or switch to its Sprint Flex lease program. Regularly $40/month, today’s offer drops the total to $20 per for the 64GB model. This includes access to iPhone Forever, which allows subscribers to upgrade after 12 lease payments. If you need more storage, you can upgrade to the 256GB capacity for $150 down. Full terms and conditions can be found below or on this landing page.