Computerworld with video over Verizon LTE in December by downloading an HD 128-minute feature-length film to a Galaxy Nexus smartphone, which took up 3.7 GB of data. At the time, Verizon was charging $30 for 4GB per month at the time, up from the normal $30 for 2GB.

In addition to tools to monitor data usage, AT&T and Verizon also have some sage, if ironic, advice to avoid high data use over cellular: use Wi-Fi when possible. "You may want to use Wi-Fi when streaming video," Verizon said in a recent list of tips to its customers to help manage a data usage allowance.

It's advice that could matter for FaceTime-over-cellular as well.

Keith Shaw talks with Computerworld News Editor Ken Mingis about today's Apple announcements at the Worldwide Developer Conference, which included new MacBook Pro hardware, MacBook Air notebooks and updates to OS X and iOS 6.

Matt Hamblen covers mobile and wireless, smartphones and other handhelds, and wireless networking for Computerworld. Follow Matt on Twitter at or subscribe to . His email address is .