Webwire: Vodafone backs Verizon; RIM sets PlayBook date

Vodafone is committed to its 45% stake in US operator Verizon Wireless, and plans to negotiate a dividend from the JV at the end of the year, despite long-running speculation it may seek to divest its stake.
RIM will debut its PlayBook tablet in North America on April 19, with some retailers set to start taking pre-orders next week.
US retail chain Best Buy plans to offer its own 4G mobile broadband service over LightSquared's network, with trials scheduled to commence early next year.
Motorola Mobility has acquired Swedish IPTV software provider Dreamgallery, with plans to integrate the Dreampark middleware platform into its service management software suite.
US politicians have called on Google, Apple and RIM to ban mobile apps that allow drink drivers to alert friends to the location of police check points.
Downloads of the latest version of Firefox’s web browser hit six million in the first 24 hours of availability, dwarfing the near two and-a-half million from Microsoft’s recent Internet Explorer 9 launch.