[shoot_the_goalie]

What should I buy in order to use that USB port on the back of the Bike+ screen? I’d like to have the ability to recharge my iPhone. Thank you.

You need to purchase a USB-C port to lightning cable for an iPhone. I would suggest you get a shorter cable though (3ft), so you don't risk the wire getting caught up in the flywheel. However, you can get all different lengths depending on your needs. Probably a good iPhone mount too.