Cingular sold its Mobitex network to Cerberus Capital Management: Mobitex is one of the earliest data networks and was the first to support RIM's Blackberry devices. The network was initially used by very niche groups of people who were frequently in the field. But once the Blackberry grew in popularity, the network began to be used heavily by traveling business people. Now, Cingular reports that 25 percent of Blackberry users worldwide use the Mobitex network, which has been referred to as Cingular Interactive. Today, Blackberries also operate over the cellular networks and many also offer voice services. The number of Blackberry users on the Mobitex network may decrease in the future if an increasing number of customers want voice services or higher speed access on their Blackberries.