Last summer's trifecta of DROIDs are all getting hit by the same over-the-air update right about now. Verizon has announced a bump up to software version 23.1.12 that's going out to the DROID Maxx, Mini, and Ultra. The OTA prepares the devices to deliver better call quality through what the carrier has coined Advanced Calling 1.0.
This update also brings along improvements to the phones' messaging client and visual voicemail service. These touch-ups are joined by your usual vague set of bug fixes.
Carriers tend to push these updates out in waves these days, so try to sit tight until the notification arrives. You can manually jam on the update button, but that doesn't always speed things along.