Bought the iPhone 7 (see below) on the $10/mo (actually $15) promo. Want to move to 7+ whilst keeping the promo, and am within the 14 day return.... Chat Reps have told me this is easy to do. Reddit told me it is impossible to do. Store (on the phone) told me it's possible.... sort of. Has anyone actually done it? Does anyone know if it's possible?