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 has sold over 3 billion iPhones since its first smartphone in 2007. Samsung got there first, but there are some caveats to consider.

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.