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.

The company’s revenue was about 10% higher than the same period a year ago, showing an unexpected ability to weather tariff blows.