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’s flagship iPhones remained the driving force behind its performance, with global sales jumping 13.4% YoY in the third quarter to $44.6 billion—the highest growth in 15 quarters.

Apple reported strong iPhone sales and rebound in revenue from China, giving a much-needed boost to two parts of the company’s business that had struggled over the past year.