There are now more than 1 billion active Apple devices in use around the world

In conjunction with Apple’s earnings report, the company on Tuesday also announced that the cumulative number of active Apple devices (a tally which includes the Apple Watch, iPhones, iPads, Macs, iPods, and the Apple TV) eclipsed 1 billion last quarter, an impressive milestone to say the least.

As for what constitutes an ‘active’ device, Apple said that any product which makes contact with any of the company’s services over the most recent 90-day period is considered to be active for purposes of the tally. Highlighting the scale at which Apple products are proliferating across the globe, Tim Cook added that the total number of active Apple devices during the 2015 holiday quarter increased 25% year over year.

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Of course, driving the boat here is the iPhone, the company’s most popular device and its primary revenue generator. As we reported not too long ago, Apple set a new iPhone sales record this past quarter with sales of 74.8 million units.

Also contributing to the impressive 1 billion figure were record-breaking quarters for both the Apple TV and the Apple Watch. Somewhat frustratingly, though, Apple refused to provide specific sales data for those two respective devices. Still, Apple’s earnings report tells us that unit sales within the company’s “other products” category (which includes the Apple Watch and the Apple TV) increased by over 60%. Meanwhile, Apple’s two other hardware products – the Mac and the iPad – both experienced year over year sales declines.

With such a large and active installed base of users, Apple CFO Luca Maestri believes that the potential for Apple’s line of services to contribute significantly to Apple’s bottom line is being wholly underestimated.