Stay on your Flex plan for 12 months and then trade-in your working phone to get the same great deals as new customers on select devices. You can do this on up to 4 lines (each line has its own countdown). The longer you wait, the more devices you can choose from. When you swap or if you cancel service, the countdown for your next deal restarts. Current Metro or T-Mobile customer? Just switch to a Flex plan and you’re ready for deals after 12 months. Like everything else in this crazy world, Metro Flex details could change.