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Apple revamped the keyboard and track pad, too, and upgraded the microphones and speakers for better audio.

Apple's shares — and the broader market — took a pounding a day after CEO Tim Cook said in a letter to shareholders that the company would miss its revenue expectations for the fiscal first quarter. The stock had fallen almost 8 percent after hours on Wednesday.

Apple took the top spot for the second straight year among all U.S. consumers. Amazon finished second, but also was first among only millennials.

Apple Inc apologized on Thursday for its controversial decision to slow down phones with older batteries, and offered consumers a lower-priced battery replacement solution.

Apple's interest is not just in mobile payments. Last year, it made an investment of billion in Chinese on-demand mobility provider Didi Chuxing. This spring, Apple CEO Tim Cook visited bike-sharing start-up Ofo during his China tour.