After its launch in retail stores last year, Apple has finally made its iPhone Upgrade Program available to those buying their iPhone online. After clicking the “Buy” option for an iPhone 6s or 6s Plus, the first screen of the checkout process includes the option to enroll in the program for $32.41 per month for a 16GB 6s or $36.58 per month with the 16GB 6s Plus. The price goes up as the storage options increase.