Having trouble keeping up with technology? Best Buy, along with Crispin Porter + Bogusky want to help you out with the new Buy Back App, an assortment of tools to keep you in sync with the fast moving world of tech. The app's Telephone Time Machine instantly transforms your mobile into a phone of any given eraa simple flick will reskin it to anything from a classic flip to a rotary-dial clunker. The Buybaculator will help you calculate how many bucks your old tech junk is worth in Buy Back gift card currency, and an upgrade checker lets you know when it's time to level up on your current mobile device.