Most of us love LTE for its speedy data connection, but it also enables Voice over LTE, which offers better audio for clearer calls. And today AT&T touted that it’s got millions and millions of folks using VoLTE on its network.

AT&T’s VoLTE coverage reaches more than 295 million people, but the big blue carrier adds that there are more than 27 million subscribers on its network that are actually using VoLTE (aka HD Voice). As of this writing, there are 23 AT&T devices that support HD Voice/VoLTE, including flagship phones from Apple and Samsung as well as more entry-level hardware like the Lumia 640 XL and Desire 626.

AT&T also notes that it’s currently working on enabling VoLTE voice and video between carriers. This month it successfully made its first VoLTE exchange between AT&T subscribers and customers on another carrier in “limited, select areas.”

While some folks almost never use their smartphones as phones, plenty of others do make calls on a regular basis. And hey, they’re still call smart “phones.” So it’s good to see carriers still focusing on making phone calls better for folks that do still make calls. Sure, there are other options for high-quality voice calls, like Apple’s FaceTime Audio, but VoLTE works across platforms without any extra work from the user.