Box and AT&T plan to lock down cloud file-sharing with a service that places enterprise content behind an AT&T VPN. The service, announced at the BoxWorks conference on Thursday and coming in the first half of next year, extends AT&T's NetBond technology to Box. It will be able to work in conjunction with the carrier's Toggle software, which separates business from personal content on mobile devices. Toggle with Box is scheduled to ship early next year.