To close the loop on the last missing piece in the iPhone—making it a fully integrated end-to-end communication and media device—Apple buying Verizon would be a game-changer, especially since trust in federal oversight is largely eroded nowadays.
Apple as a company are hitting walls expanding their business, having a carrier would give them another point of innovation
(The rumored Apple self-driving car, if true, was also a silly idea. Aside from self-driving cars being an order of magnitude or two more difficult than popularly expected, building cars is not something Apple has any experience with, and is a capital-intensive business with little barrier to entry [besides capital]. Buffett noted that totaled since their beginning until now, car companies and airlines have, on net, lost money for their investors.)
[1] https://www.joelonsoftware.com/2002/06/12/strategy-letter-v/