Armstrong told CNBC's Squawk Box from the Allen & Company media and technology conference in Sun Valley, Idaho that he uses three phones. ""The Samsung Note I have, and I have an iPhone also, they are excellent for me for Web viewing, entertainment, video, those type of things. And I use those phones everyday," he said. "But BlackBerry for me is a utility."
"If you look around Sun Valley," he continued, "you see people who have to do a tremendous amount of work...on BlackBerrys."
BlackBerry has been struggling for years, but Armstrong wishes the best for the company's future. "It's a great utility device. I love my Samsung Note, love my iPhone," he said. "But the stuff about BlackBerry, their future will hopefully be driven by utility. I don't know what their plans are, but I'd be happy if they did well."
Separately, TheStreet Ratings team rates BLACKBERRY LTD as a "sell" with a ratings score of D. TheStreet Ratings Team has this to say about their recommendation:
"We rate BLACKBERRY LTD (BBRY) a SELL. This is driven by several weaknesses, which we believe should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. The company's weaknesses can be seen in multiple areas, such as its feeble growth in its earnings per share, disappointing return on equity and weak operating cash flow."