Simple. Buy out ALL potential competition and shelve it?!?!
Remember the famous rumor that a young engineer had designed a carburetor that got like 50 miles to the gallon back in the late 50's and early 60's??? Ford supposedly bought the patent & business from the guy for a hushed up amount of money back then (I want to say it was 5 million which was a fortune in like 1960) and once owned by ford, they basically shelved it. Gasoline was 15 cents a gallon back then depending on where you lived and I lived on the East Coast. A 50 MPG carburetor would have destroyed the gasoline market and ford simply could not let that happen........ As the story is told, give or take some details.
It is also a "functional device" for the holding co. so not only might they just buy and shelve, they might buy, shelve, and secretly try to sell a "reverse engineered" product to the competition. Just because you are a "holding" company does not mean you buy business's to keep under the umbrella, you buy and sell company's, patents, products strategically for what benefits the "Mother-ship" (holding Co.) the best.
Just my 9 cents ..........
The question still remains: If Hans Vestberg works for VERIZON, not VERIZON WIRELESS, what does Verizon want with a smartphone company?