Apple Inc. reported its fastest quarterly revenue growth in more than three years, easily topping Wall Street estimates, after demand picked up for the iPhone and products in China.

Apple's best revenue growth in three years failed to impress, with shares down about 1% in volatile trading on Friday, as investors questioned whether a tariff-driven surge in iPhone sales would last.

Apple may be the tech company most exposed to the Trump-era global tariffs, with the majority of its iPhones still manufactured in China. But the company calmed Wall Street’s concerns with its latest financial results, which showed a surge in iPhone sales. CEO Tim Cook also laid out a roadmap to ease the impact of levies.