Apple says there are now more than 1 billion active iPhones, an enormous milestone for the company that speaks to the phones’ continued success and longevity. There are now 1.65 billion Apple devices in active use overall, Tim Cook said during Apple’s earnings call this afternoon. Apple sold its billionth iPhone in 2016, and in January 2019, Apple said that it had hit 900 million active iPhone users. Apple counts a device as active if it has engaged with an Apple service within the past 90 days, a spokesperson told The Verge. Update January 27th, 7:10PM ET: This story has been updated with details on how Apple measures active devices.