https://www.theguardian.com/technology/2019/jan/03/iphone-slump-the-rivals-taking-a-bite-out-of-apple > As firm’s stock falls over sales warnings, it has competition in bid to be best smartphone > As Apple’s shares tumble following its cut in forecasts, the company is laying the blame squarely on the economic slowdown in China. But that’s only part of the problem.