Apple released iOS 8.3 (beta) 12F5047f—the third beta release of the iPhone and iPad operating system—to developers Thursday . The most notable change in the release is a known issue with Verizon LTE Voice. From Apple's patch notes:
LTE Voice does not work properly with Verizon.
Workaround: If you are using Verizon, please set LTE to Data Only for this seed.
Developers can download the update through the Apple Developer Connection. Apple also cautions developers that this build, "should only be deployed on devices dedicated for iOS 8.3 beta software development."
Apple is gearing up for a release most likely in time for the launch of the Apple Watch on April 24th.