MacRumors reports that Apple today seeded the sixth beta of an upcoming iOS 11.3 update to developers for testing purposes

Registered developers can download the new iOS 11.3 beta from Apple's Developer Center or over-the-air once the proper configuration profile has been installed from the Developer Center.

iOS 11.3 is a major update that introduces a long list of new features, like Messages in iCloud for saving space and syncing messages across devices, and ARKit 1.5, a new version of ARKit able to more accurately map irregularly shaped surfaces, recognize images, and place objects on vertical surfaces like walls.

  Apple Seeds Sixth Beta of iOS 11.3 to Developers